For the rider demanding no-compromise performance. This 117CI to 131CI Stage IV

Kit was engineered by the pros at Harley-Davidson to deliver instant arm-stretching torque through the entire rpm range. Made for riders seeking maximum displacement, compression, and power to weight ratio. This Stage IV Kit features the finest Screamin’ Eagle® components. Many of these new components were informed by extensive testing by the Harley-Davidson Factory Racing Team for the King of the Baggers racing series. The Stage IV kit consists of: All-new Screamin' Eagle® Extreme CNC-ported cylinder heads, 68mm throttle body and new cast 68mm intake manifold, new SE8-550 high-lift cam and 6.8 g/sec fuel injectors work together to feed the engine large volumes of air and fuel to help maximize power. New forged high-compression pistons and rings are designed to withstand increased combustion forces. Also includes high-performance tappets and new patent protected 4.31" steel sleeve cylinders.Screamin’ Eagle and Stage IV badging on the cylinder heads and timer cover highlights the powerplant.

• Black Highlighted

• We’ve done your homework - Engineered and tested as a complete collection of

high-performance components by the Screamin’ Eagle pros at Harley-Davidson

• This combination is designed for wide open throttle along with high end RPMs and a significant torque increase from a cruising speed

• Provides thrilling acceleration when twisting the throttle

• Can be installed without removing the engine from chassis

• Screamin’ Eagle products are not available for sale and are not street legal in all countries. 

Part Number: 92500146

Fits '25-later Softail® models. Requires ECM recalibration with Screamin Eagle® Pro Street Tuner for proper installation. Does not fit California models.