Harley 103 stage 3 kit. Long story short, forced to upgrade due to my own fault.

Harley 103 stage 3 kit. Bore stock cylinders and forge pistons 580 or 608 or 611 cam your choice. com Jun 2, 2025 · If you own a Harley Davidson with a 103 engine, you may be eager to take it to the next level with a Stage 3 kit. 3 torque S&S header and slipons plus tuned ram intake 72 hp 82 torque added S&S 585 cams 87. This Stage III Street Performance Kit combines system-matched Screamin' Eagle big bore cylinders, high compression pistons and performance cams and valve train components with the Original Equipment cylinder heads for a cost-effective boost in torque and Harley Stage Kits (a. I'm tuning with a SERT. If you like low end power, and don't really see yourself revving the engine past 3500-4500 much, there's no need for the SE Stage 4 at about 3 times the price of a Stage 2 cam upgrade parts and labor. Our Fuel Moto 107" kit Mar 13, 2023 · Understanding Harley Stage Upgrades Before evaluating the Harley stage 3 upgrade cost enhancement, it is essential to comprehend what’s included. Jan 23, 2025 · This kit also requires the separate purchase of the Cam Drive Retention Kit (91800088) and Cam Service Kit (17045-99D) which are available from a Harley-Davidson dealer. Basically I want a stage 2 bike. Our Fuel Moto 107" kit works with stock cylinder heads and valve train, or if you are looking for the next level of performance complement your build with our Fuel Moto Level B heads. Nov 12, 2010 · This kit also requires the separate purchase of the Cam Drive Retention Kit (25566-06) and Cam Service Gasket Kit (17045-99C) which are available from a Harley-Davidson dealer. Sep 7, 2023 · If you're looking to take your Harley-Davidson motorcycle to the next level, you might want to consider the Stage 3 upgrade. Gasket kit Recommended (not included) Performance Clutch kit Aug 1, 2025 · Zipper’s Popular Muscle 107” Kit for Twin Cam® 96/103” engines boost torque and horsepower north of 120! The Muscle 107 is a top end and cam kit that gets its displacement boost by increasing the cylinder bore size to 3. I see no reason not to do something with the heads Aug 31, 2024 · Zipper’s Muscle 117” Kit for Twin Cam® 96/103” engines increases displacement with new 4-1/8” bore cylinders while retaining the factory 4-3/8” stroke. No machining, balancing, or splitting the crankcasess. Stage I is the starting point with the option to upgrade to a higher numbered stage kit in the future. 30 Was: $1,195. We have big bore kits from top brands like S&S Cycle and Revolution Performance. The Stage 2 includes the Stage 1 parts, High Flow Air Filer, block of plate, etc. I want to do the 103 upgrade this month and I am looking for some insight. Mar 2, 2014 · I ran a stage 4 kit on my '07 Batwing consisting of 211 cams, 10. ” If you are looking for how to squeeze out more power from your Harley, there are several techniques or methods that you can adopt. For those that have tried both is it worth the cash for a stage 3 or is the stage 2 torque cam enough fun! A big bore kit is an easy way to achieve more displacement, and if you can install it without rebalancing flywheels or boring the crankcases, that’s about as easy as it gets. New guy here. What exactly is a Stage 1 upgrade for Harley-Davidsons? There are no hard and fast rules on what constitutes Stage 1 vs. Stellar Performance If you’re upgrading from a Jul 21, 2023 · There's no doubt about it - the Twin Cam 88 is a great engine, but even the best engines can be improved with the right upgrades. S&S quick pushrods and tubes. 3 hp 80. Quality Parts available for all 4 Stages! Harley-Davidson 2006 Dyna Wide Glide Screamin Eagle 103 Stage I Kit 29877-06 Pre-Owned · Harley-Davidson $1,123. Street Performance Kit from Screamin’ Eagle price is $1,819. 2 hp 108. A Harley upgrade includes modifying internal engine components which can be divided into various stages. But Harley stage 3 vs. Shop Screamin’ Eagle air cleaners and kits made specifically for your bike model and year. Nov 16, 2009 · Anyone out there done a SE 103" Stage 3 Kit with the new 259E cams. The higher number kits provide the greatest increase in performance. Jul 9, 2009 · I did the upgrades one at a time and did the dyno's between each stage here are my numbers: Stock with 1600 miles on engine: 63. I’m contemplating a stage 2 and or a stage 3. 4 ft/lbs. Oct 18, 2008 · The kit PN you reference is the stock 110 kit, if you look at the little dyno chart for this kit vs the PN 92500035 Stage III kit, the Stage III kit makes more power and torque. Features & Benefits. We can turn your 96” engine into either a 103 or a 107”, and your 103 into a 107” simply by resizing the factory cylinders. ? The dyno charts in the H-D catalog look impressive. 95. The 2017 is having a 114 stage 3 installed on delivery, ill be anxious to see how it compares in HP torq and MPG. Includes: porting heads,porting intake,shaving heads,changing cams,changing pistons,changing valves,valve seats Screamin’ Eagle stage kits are offered in a variety of options designated as Stage I, II, III and IV. A Harley-Davidson “Stage 1” horsepower increase involves getting Diablo Stage 2. This 50-state street legal kit combines all the proven components of the Screamin Eagle models the 4-3/8" stroker flywheel assembly, 3-7/8 Harley Screamin Eagle Performance Stage 3 103 High Compression Upgrade Kit Harley Momma Motorcycle Parts (991) 98. Jul 2, 2012 · Roeder Racing Monroeville OH puts in bigger valves and his own heads guarantees 100 HP 100+ torque with 103 kit cam heads valves. This modification aims to improve the overall performance of the motorcycle. This kit contains five different spacers to achieve proper sprocket alignment. Would like to know what HP/TQ to expect if i decide to go with this kit. 110/112 Horse Power & 120/ T. Nov 3, 2023 · One of the commonly asked questions among Harley owners is “What are the top Harley 103 engine performance upgrades. Member of the Torque and Recoil Club Reply Like Jun 16, 2025 · Here are answers to common questions you might have about upgrading your Harley-Davidson through the Stage 1, 2, 3, and 4 kits, ranging from differences in upgrades to costs and performance. However, it is important to understand what other riders generally mean when they throw these terms around. The parts included in the third stage upgrade kit include; Big bore cylinders The big-bore cylinders increase the engine’s displacement and combustion flow, resulting in increased torque. Find Screamin' Eagle Milwaukee-Eight Engine Stage III Kit - 107CI to 119CI at Harley-Davidson. See full list on wulfmoto. Specifications. At the Stage 2 kits seems to also produce a modest 70-80 TQ and HP as shone in the Screaming Eagle Catalog. Oct 28, 2023 · Pros & Cons of Harley 103 Engine Pros Long-lasting Power The 103 engine is so robust that it can easily clock over 80,000 miles without requiring any major rebuilds. Screamin' Eagle® Street Performance Stage 4 Kit - 103 Cubic Inches This Street Performance kit provides the maximum horsepower output for a legal 103 kit that will maintain the factory warranty. However, most of these methods are expensive, which a lot of people can’t afford. 5-1 pistons, stock heads but my Harley tech did all the custom head work, SE Race tuner, stock header with Rush slip ons and it dyno'd 102. Stage 2½ Performance Package: Designed with touring in mind, this package offers extremely broad torque throughout the entire RPM range. 00 Sep 8, 2025 · The stage 4 cam is a poor choice for my riding style. The stage 4 kit needed a 2 week lead time, for ordering. Here’s what Stage 3 upgrades and how much it can cost. This kit also requires the separate purchase of the Cam Drive Retention Kit (25566-06) and Cam Service Gasket Kit (17045-99C) which are available from a Harley-Davidson dealer. I can buy stage 2 kit (I don't need air cleaner) or stage one kit with a different manufacturer's cam or seperate parts "16549-99 SE 3-7/8" BIG-BORE CYLINDER KIT" with "21966-07 Upgrade your motorcycle and shop Harley-Davidson Screamin' Eagle Stage 3 Kits at Harley-Davidson. With a Bassani 2 into 1 road rage exhaust, horsepower Inc V2 air cleaner, 110ci tire shredder kit, and power vision tune. May 1, 2023 · So, what does a stage truly refer to? Let’s see it first. Stage 3 Performance Upgrade for Harley Addicted to power? This month you can also get a Screamin’ Eagle Stage 3 Upgrade with our service special. This kit includes Screamin’ Eagle® CNC Ported Factory Cylinder heads, 58mm ETC throttle body, SE-259E cams, 10. Includes: Stage 2½ CNC-ported heads CP ® forged piston kit R&R ® or S&S ® gear drive cams S&S ® gear drive kit Adjustable pushrod kit Top end gasket kit Which one is most preferable compared with Harley Stage 3 Vs Stage 4? It depends on personal choice. The investment in parts alone can range from $1,600 to $2,500, and if you choose to have a professional handle the Upgrade your motorcycle and shop Harley-Davidson Screamin' Eagle Stage 2 Kits at Harley-Davidson. 6 torque added 106 cylinders 99. 107" Big Bore Kit The Fuel Moto 107" Big Bore is a complete kit with the absolute highest quality components, all of which have been extensively tested in house both on the dyno as well as in real world conditions to deliver top level performance. Minimal Issues Compared to other Harley engines, the 103 has fewer problems, most of which can be quickly resolved with the right guidance. 5 hp and 96. (I have the dyno sheet in my photo gallery. 3 torque added S&S reworked heads 106. Good for performance and reliability. Typically, the upgrade involves new parts such as a larger bore kit and a high-performance camshaft, necessitating a higher financial outlay in comparison to previous stages. Feb 15, 2012 · The new Screamin’ Eagle Street Performance Stage 4 Kit – 103 Cubic Inches (P/N 92500011, $1,849. Harley-Davidson OnlineshopBuild a fast, reliable 110 cubic inch Twin Cam hauler without having to remove the motor from the chassis. Stage 1: Intake, exhaust, and ECM remapping Stage 2: Cam upgrade with adjustable pushrods Stage 3: Big bore cylinders, matching pistons, and cam upgrade Stage 4: Stage 3 + Upgraded heads, clutch components, throttle body, and lifters If you want to find out more about Harley Upgrade kits So what are Harley-Davidson Screamin' Eagle Stage Kits and how can they help improve your ride? It's all about the performance, look and feel with the powerful lineup of Screamin' Eagle Stage Upgrades. Will only be using stock heads with a . Upgrade your 110 cubic inch Original Equipment cylinder head to a fast Equipment cylinder head for optimal torque and performance- Harley 110 stage 4 will cost $2169. Nov 19, 2008 · Hi. Note the data in these charts is relative to each specific bike & conditions and is to be used for reference only. Harley Davidson Stage 3 Performance Customer Satisfaction We offer full customer satisfaction with our Harley Davidson Stage 3 kits, giving you a result that you will be amazed with. Luckily, several models are ready to rock with this upgrade! At Dennis Kirk, you will be able to find the Big Bore kit you need to accomplish your Stage 3 upgrade. That’s a testament to its longevity. Feb 13, 2012 · I have a 2010 Ultra with the 96" with Rhineharts and stage 2 Arlen Ness big sucker and ThunderMax. 9 intakes 1. Jan 23, 2025 · This kit also requires the separate purchase of the Cam Drive Retention Kit (91800088) and Cam Service Kit (17045-99C) which are available from a Harley-Davidson dealer. Stage 4 is the best but stage 3 is a popular option as well. Check out the screamin eagle race parts catalog for the details!! If you're really on a budget, my dad put SE-255 cams in his 96 Nov 1, 2020 · The Stage IV kit comes with high compression pistions, both the 103 and the 110 kit. H-D Milwaukee-8 117 Camshaft Shootout >click here< H-D Milwaukee-8 114 Camshaft Shootout >click 2014 Street glide. Dropped to high 30s around town. 875" big bore cylinders, 10:5-1 forged stroker pistons the twin cam performance cylinder heads, 258 cams, screamin eagle EFI tuner, heavy breather kit, bubs 7 true duals, Screamin eagle cold racing plugs for high compression Jul 28, 2025 · Unleash the hidden potential of your Harley Davidson 103 engine with expert tips and upgrades, taking your ride to unprecedented levels of power and performance. Do the 103 stage 3 upgrade and do the Factory head exchange program. Stage 3, How does it improve your bike? Stage 3 maximum stage of power and speed. that included stage 4, full exhaust, some other little odds and ends, and a dyno tune. 5 to 1 compression pistons, Perfect-Fit pushrods, Screamin’ Eagle Find Screamin' Eagle Twin Cam Bolt-On 110CI to 117CI Kit at Harley-Davidson. Compare top-rated aftermarket air cleaner kits for Harley Davidson motorcycles. More on 107" Big Bore Kits » Nov 19, 2008 · I'm considering going to the Screamin' Eagle 103 Stage III or IV kit listed in the H-D catalog. Your cylinder tops are decked for trueness and new 10. Mar 18, 2025 · Upgrading your Harley with a Stage 2 kit is a popular choice for riders looking to enhance their bike's performance. 4k later (free labor, having a friend who's a harley mechanic) with a full stage 4 kit: 120 tq @ 3500 rpms and 122 hp @ 5800 rpms. This kit works on all 2007-2016 Twin cam 96" and 103" motors and delivers absolute top level performance and reliability. This kit works on all 2007-Current Twin cam 96" and 103" motors and delivers absolute top level performance and reliability. Engine Kits Big bore engine kits for a Harley-Davidson engine involves replacing the stock cylinders and pistons with larger ones, effectively increasing the engine's overall displacement. 2 hp 107. Free shipping on orders +$50 for members. Feb 24, 2023 · The Stage 3 kit can increase horsepower by up to 30%, and it's best suited for riders who want maximum power for high-speed cruising and long-distance touring. 5 torq this is without cams i was preety happy with them results Jul 15, 2025 · The 2016 Harley 103 Motor with Stage 3 Kit Upgraded Tire Shredder Kit is a powerful and high-quality engine upgrade designed specifically for Harley-Davidson motorcycles. 00 in parts which is cheaper then the Stage 3 and 4. Now through February 28th, SAVE 15% on Screamin' Eagle® stage 2-4 upgrades! my stage 4 on my 103 was 5200$ in 2014. Explore the best air cleaners for Harley 103 to boost airflow, engine performance, and style. 2020 Road Glide Limited, Klock Werks Pro-Touring windscreen, Grasshopper drivers backrest, highway pegs, S&S Grand National mufflers, S&S Stealth air cleaner assembley. I understand the second option includes SE Super Tuner. May 27, 2015 · The Harley Screamin' Eagle Stage III 103 Kit provides 2014-later Project Rushmore Tourers with more horsepower and torque. Learn how to maximize your H-D's potential with the best performance upgrades available. 95) from Harley-Davidson Genuine Motor Accessories produces the maximum horsepower output for a Feb 22, 2019 · If you're always looking for new ways to pump up your adrenaline, you must be riding a Harley-Davidson® motorcycle. Mar 21, 2024 · Part of the fun of owning a Harley-Davidson is customizing your bike with upgrades and modifications. Harley Stage 1 Vs. 1 torque. 8 hp and 116. 030 Cometic HG and upgraded SE spring kit at this stage. Screamin Eagle Pro Stage IV 103 Kit - If you re looking to build a fast, track-ready 103 and this kit eliminates the guess work. This kit has the 259 cams and 10. The Stage 3 kit includes larger diameter cylinders, high compression forged aluminum pistons and a performance cam upgrade that gives you an even higher lift than what you get from the Stage 2 upgrade kit. Oct 25, 2012 · I recently discussed an upgrade from 96 to 103 Cu in with two options from HD. I'm considering going to the Screamin' Eagle 103 Stage III or IV kit listed in the H-D catalog. 95 in Harley 103 stage 4. C. 615 exhaust valve & CNC port. May 3, 2025 · Discover key facts and statistics about the best Harley 103 engine upgrade, including performance gains and market trends. The beauty of a Stage 2 upgrade is that it builds on the enhancements of a So I have a 2020 Streetbob with a stage 1. Stage 3 upgrades Both aftermarket and OEM companies utilize the term “stage” to denote various levels of modification and power enhancement for motorcycles. Screamin Eagle Stage Kits About Us Privacy Policy Return Policy FAQs Terms & Services Contact Us Harley Davidson Accessories and Parts SCREAMIN EAGLE 103 INCH STAGE I KIT (Harley-Davidson) SCREAMIN EAGLE 103 INCH STAGE I KIT (Harley-Davidson) For EFI Models. The 50-state street legal kit increases the displacement of your Twin Cam-equipped model from 96 cubic inches (1584cc) to 103 cubic inches (1690cc). Aug 14, 2016 · I just traded my 2012 103 with a stage 4 kit installed, and got 45mpg highway on long runs no problem. The exclusive bolt Feb 23, 2008 · IM presently having a 103" built by my Harley dealer it includes the 3. That’s the idea behind the S&S® big bore kits for Milwaukee Eight & Big Twins engines. 5 Kit 98"-107"| $2,899 1999-2006-2007-2016 Harley Davidson models Stage 2 heads 1. In this guide, we’ll explore the details of stage 1, 2, 3, and 4 upgrades, including the components, benefits, and considerations of each. Stage 2 Vs. This kit includes a Stage 3 engine upgrade, which enhances the performance and efficiency of the motor. There are affordable and effective Jun 2, 2010 · I just ordered this same 103" stg 3 kit last week. ? The dyno charts in the H-D catalog Mar 18, 2025 · Understanding the costs involved in a Harley Stage 3 upgrade is vital to making an informed decision. This Stage III Street Performance Kit combines system-matched Screamin' Eagle® big bore cylinders, high compression pistons and performance cams and valve train components with the Original Equipment cylinder heads for a cost-effective boost in torque and performance. Most of the features aim to improve the engine. com. a. We will even provide a dyno performance map of your engine performance when you pick up your Harley showing the increased power and performance. Talk to us today about our Stage 3 Harley Davidson Performance Kits May 30, 2015 · I did the stage one on my blackline recently with the 103 , 2into 1 big radius screaming eagle breather, also screaming eagle pro race tuner my dynos were after 79. It seems the cost of parts is ~1300 BUT Find Screamin’ Eagle Milwaukee-Eight Engine Stage III Kit - 114CI or 117CI to 122CI at Harley-Davidson. This kit was built for extreme performance and designed for a 577 Zippers Red Shift Cam and an upgraded throttle body. Interstate cruising speeds of 80-85 two up I got 39-41 mpg with a low of 35 when dogging it. I have a '09 FXD. The stage 3 cost me 42xx (with a 10 inch windsplitter, so -160'ish)" Chris Logged Chris 2021 FLHXSE A complete step by step Harley-Davidson 103 engine rebuild and upgrade to Stage 3. The Stage 2 kit costs $899. The upgraded tire shredder kit ensures better traction and control, making it an ideal choice for motorcycle enthusiasts Build your dream motor with the best Harley Performance parts from Dennis Kirk. This upgrade typically involves replacing the camshaft to improve engine efficiency, leading to better throttle response and increased horsepower. Build a fast, reliable 110 cubic inch Twin Cam hauler without having to remove the motor from the chassis. Clutch components, gaskets and other Jul 14, 2025 · How Does The Cost Of The Stage 3 Big Bore Kit Compare To Other Performance Upgrades For Harley Davidson Motorcycles? The Stage 3 Big Bore Kit costs more than some other upgrades for Harley Davidson motorcycles. Upgrade your motorcycle and shop Harley-Davidson Screamin' Eagle Stage 3 Kits at Harley-Davidson. Separate purchase of Cam Spacer Kit (25928-06) is recommended. By incorporating stage kits, such as the Screamin Eagle bore kit and restrictive exhaust, you can Sep 25, 2011 · Anyone here have any experience putting the SE Stage 1 kit on the 103? I've heard (on another forum)there isn't much improvement and to leave the motor alone. S&S Lifters Cam gasket and bearing kit. You can choose another one as a personal option. Kit includes CNC-Ported Factory Cylinder Heads with high performance va Harley Stage 3 Upgrade Features Harley’s third-stage upgrade includes numerous parts that significantly improve the bike’s performance. Note: this is a fraction of the charts from our database and testing. stage 4: which will improve your ride? Stage 4 has better horsepower, air velocity, lift, and a larger carburetor than stage 3. Free shipping on purchases over $50 for members. Jul 24, 2014 · From Harley web site: The Stage II Big Bore Kit provides the parts you need to increase the horsepower of your EFI-equipped model. Keeping that in mind, manufacturers of HD offer stage upgrade kits. Kyle, what tuner are you using? Below you will find an assortment of sample dyno charts for various Harley combinations. Screamin’ Eagle Upgrade kits) are complete packages of OEM performance parts. This Stage III Street Performance Kit combines system-matched Screamin' Eagle® big bore cylinders, high compression pistons and performance cams and valve train components with the Original Equipment cylinder heads for a cost-effective boost in torque and performance. Bolts in. 5:1 pistons. k. I've had several Harleys over the years and have always used Screamin' Eagle parts with satisfactory results. Usually, the stage 4 upgrade Feb 24, 2011 · I have the 103" stage III in my '10 FLHTC. The local dealer offered 20% off list for it. Mar 21, 2009 · But the 103 Stage 2 kit if installed "will" be covered. Here is the good news. Two kits discussed were 29893-07b which was has the 255 cams and the other is PN#27513-08b which has the 259E cams. Thanks Gents When modifying motorcycles, Harley-Davidson owners are known to be among the most extreme. SCREAMIN’ EAGLE® STREET PERFORMANCE BIG BORE STAGE 4 KIT – 103 CUBIC INCHES This Street Performance kit provides the maximum horse-power output for a legal 103 Kit that will maintain the factory warranty. . Nowadays, stages 3 and stage 4 are the most familiar. 5:1 forged pistons are precision-fit using the latest Sunnen equipment, while your heads receive Zipper’s high-breathing Stage III treatment with CNC porting, new guides, oversize valves and performance springs. Get everything you need in one package. Valve Springs The This kit also requires the separate purchase of the Cam Drive Retention Kit (25566-06) and Cam Service Gasket Kit (17045-99C) which are available from a Harley-Davidson dealer. 937”, while retaining the factory 4-3/8” stroke. The stage 3 kit was shipped and at the dealer in 2 days waiting for the bike to be dropped off. Bump the early Twin Cam from late from 96ci or 103ci to 110ci as well as adding matched cams/cam plate/oil pump and everything else a high performance cam chest needs to reliably make big power. Is anyone using these, or can someone give me an "informed" opinion about them as to reliability, performance, etc. Oct 1, 2014 · This kit also requires the separate purchase of the Cam Drive Retention Kit (25566-06) and Cam Service Gasket Kit (17045-99C) which are available from a Harley-Davidson dealer. Known to remove 20–40° temperature out of the engine. Head Hoggers – Stage 3 103/107″ kit CP 103/107″ pistons ( compression of your choice ) Head Hoggers stage 3 heads ( customer supplied heads ) Head Hoggers ported throttle body/carb,intake Performance cams ( profile per setup ) SE adjustable pushrods Injectors S&S Premium lifters. Jun 1, 2015 · This street-legal, Stage III kit gives 2014-later Harley-Davidson Touring models with an Original Equipment Twin Cam 103 engine a boost in everyday performance while maintaining the factory warranty. Must send in stock heads for rework. Nov 10, 2012 · Anyone done this SE Stage 4? Input appreciated. I wasn't happy at first cause I was hoping for 105hp and it made 100hp and 101ft lbs of tq. Order original Harley-Davidson Screamin Eagle Big Twin (Twin Cam & Milwaukee Eight) Stage Kits online at Thunderbike Shop. ) BUT for $900 more you can get the 103" stage IV engine. Long story short, forced to upgrade due to my own fault. Official Harley-Davidson dealer with fast global shipping & largest selection. Results can/will vary. Free shipping on orders $50+ and free returns. 2. Here, we discuss the Differences between Harley Stage 1 Vs. Mar 16, 2014 · It has gobs of torque right off of idle, maxes at about 103 TQ at about 3500, and drops off hard at 4500. 5% positive Aug 27, 2008 · Hi; I am thinking to upgrade 103" but I'm really confused about which one to choose. Stage 2, 3 or 4, and everyone’s path in the pursuit of horsepower will be a little different. 1 hp 89. Use the Ride Selector at the top of the page to find all of the parts that fit your specific Harley. Bring your Twin Cam 88 motorcycle up to the same displacement and power output as the CVO Screamin Eagle models a powerful 1690cc. Enhance your Harley-Davidson with the Screamin' Eagle 103 Big Bore Stage I Kit for improved performance and power. Buddy did it great work famous racer factory Harley great shop check it out Ohio Bike Week! Screamin - Screamin Eagle Stage Kits - Harley-Davidson® Parts and Accessories Screamin Eagle Stage Kits Aug 19, 2024 · The Screamin’ Eagle performance division of Harley-Davidson offers four upgrade stages. Complete 110" Big Bore and Cam Chest Kits! Upgrade to the biggest bolt-in performance kit S&S makes for 1999-2017 Harley-Davidson® big twins (except 2006 Dyna® models and 2017 touring models). Stage 4 Kit The Stage 4 kit is the most comprehensive upgrade offered by Harley-Davidson. No need to bore or even split the cases, just do the cylinder and piston swap. I like the engine combo a lot. gh4 wixot2 2nk4p icr klu wa c4wkle wpsc ag p6v