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Screamin' Eagle Street Performance Big Bore Stage IV Kit - 103 Cubic Inches

Part Number 92500011


Finish / Color: Black Highlighted



This Street Performance kit provides the maximum horsepower output for a legal 103 kit that will maintain the factory warranty.

  • Black highlighted
  • Includes forged 10.5:1 high compression pistons and rings, SE 58mm throttle body, SE CNC ported cylinder heads, SE-259 cams, perfect-fit pushrods, top end gasket kit, and heavy duty clutch spring
  • Street Performance kit produces 96 hp and 105 lbs-ft of torque
  • All EFI-equipped models require dealer installed ECM calibration download or use of the tunable Screamin' Eagle® Street Tuner Kit (priced separately)
  • Recalibration is required for proper installation, See Dealer for details, Labor cost not included

Fits '16-later Softail® (except FLSS, FLSTFBS and FXSE) and '10-'16 Touring models (except '14-'16 models with Twin-Cooled engines) equipped with a Twin Cam 103™ engine. Fits 49-state '10-'11 Touring models equipped with a Twin Cam 96™ engine with separate purchase of Screamin' Eagle® 3-7/8" Big Bore Cylinder Kit. '10 FLHX and FLTRX requires dual exhaust. Does not fit Trike models. Installation requires separate purchase of Primary Cover Gasket. Cam Drive Retention Kit P/N 25566-06. Cam Spacer Kit P/N 25928-06 is recommended. All EFI models require ECM calibration for proper installation. '17-later models require recalibration with Screamin' Eagle® Pro Street Tuner (sold separately). Labor cost not included. See Dealer for details.

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  • Model
  • These Screamin' Eagle® products are 50-state street-legal for sale and use on all vehicles, including those that are pollution controlled. Complies with the requirements of 40 CFR Part 86, subparts E and F.


Installation of automatic or manual compression releases on large displacement engines is highly recommended.

  • Dealer Install Recommended

  • Warranty

    1 year limited warranty – Go to for full details
  • Requires ECM Calibration

  • Sold in Unit

  • In The Box

    Forged 10.5:1 high compression pistons and rings, SE 58mm throttle body, SE CNC ported cylinder heads, SE-259 cams, perfect-fit pushrods, top end gasket kit, and heavy duty clutch spring
  • Sold Separately

    Contact your local dealer for details
  • Upgrade Stage Level

    Stage IV
Street Performance Big Bore Stage IV Kit - 103 Cubic Inches is rated 4.5 out of 5 by 13.
Rated 5 out of 5 by from 2012 FLHTCU I had the kit installed about 4 yrs ago and haven't regretted one minute of it. I have the Vance & Hines 2 into 1 pipes for around 112 decibles. I'm heard and felt. Kicks out 108 hp and 110 torq. Did put on a set of J&P Mother Jugs cooling fans for idle & low speeds in traffic. Does get hot in the DFW area at times.
Date published: 2017-04-21
Rated 5 out of 5 by from Stage IV in 2012 FLHTK After test riding a new Milwaukee 8 bike, the only thing wrong with my FLHTK 2012 bike was I rode the new, very high torque Milwaukee 8. After having the 103 Stage IV kit installed and Dyno tuned using a Screamin Eagle Performance Tuner, I got 107.4 HP max and 110 ft-lbs Torque. I have Vance & Hines Power Duals with Monster Oval pipes and a Screamin Eagle 58mm Air box. The bike now feels great, power is always there to be tapped into in all gears and at all speeds. I am very pleased. Can't wait to ride the Dragon again. Thank you Redstone Harley Davidson!
Date published: 2016-09-23
Rated 5 out of 5 by from Bitchin' 117 hp 119 tq with Supertuner. Substituted S&S roller rockers and lifters. H-D Arthur St. in Louisville KY did a great job with wrenchin' and tuning. The main trouble I have is gettin' the silly grin off my face!
Date published: 2016-08-10
Rated 1 out of 5 by from Very disappointing Motor barely runs better than stock and at some RPMs the stock motor made more power. The dealer cannot tune it correctly and I don't even like to ride the bike anymore. I have a stage 4 in a different bike and love it but this motor is tuned so poorly it is sickening. I keep getting the runaround at the dealer when I ask them to fix it. They say they tuned it correctly and then later say their dyno needs repair. I could have got a much better product with aftermarket parts and the motor company let me down this time. I stand up for the Harley motor packages and my friends told me I was a fool. Now I think they may have been right. Wish I never touched the motor and could not be more disappointed.
Date published: 2016-08-05
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Best muffler to fit with this kit

What would be the best muffler to fit a '13 Anniversary FLHTK, with a SE air cleaner for 58 mm throttle body under OEM cover and this stage IV kit ? Thanks, regards, Pascal.
Asked by: Pascal
Thank you, and what about a street legal OEM muffler for CVO, parts number 64900198 & 64900199 ?
Answered by: Pascal
Date published: 2017-02-11

Approximately how many man / labor hours does it take to install the SE street performance Bg Bore Stage IV kit on a stock 2015 FLHXS?

Asked by: jackdrisc
I had my Stage IV Kit installed February of 2015. The Stage IV engine break down and build up was 8 hours of labor. The DYNO Tune to get everything right was 3 hours of labor. Depending on the technician, prepare for at least 10 hours of labor. This also included some items not included in the kit such as the upgraded cam plate and hi flow oil pump. When you decide to make this jump, get everything you want in the engine to keep cost down. Some dealerships will compromise on labor rates when other items are purchased and are part of the original build. Good luck. Thunderbird HD in NM works with their customers to build the bike of their dreams. Great Shop!!!
Answered by: Ponser
Date published: 2016-04-09

Are the pistons in the 103 SE Kit, part #295000011 forged.

Asked by: MrClean
Hi MrClean, Yes, the pistons in this 103 ci Performance Stage 4 Kit are forged. Thank you for your question.
Answered by: FXS78
Date published: 2015-09-02

103 CI upgrade

I have 2008 Crossbones. It currently has a 96 CI, I plan to get the 103 CI upgrade, once I get that will this kit work with that Big Bore kit?
Asked by: Thracian

stage 4 kit

I am looking at a stage 4 kit for a streetglide. My question is what is the difference between a street legal kit and a race kit...the torque curve looks much flatter on the race kit
Asked by: Tedwilliams09
Hello Tedwilliams09, There are quite a few differences between the kits. The Street legal kit will meet emissions and is street legal. The Race kit is for race use only and does not meet emissions. The cams, pistons, bore size, and many other items are different between the 2 kits. Thank You!
Answered by: JD34
Date published: 2015-05-06
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