Engine
Active filters
- Bolt-on power: +40–50% on stock 107", 114" and 117" M‑Eight motors.
- Compressor and turbine housing with Garrett internals; plenum with integrated blow-off valve.
- Includes injectors, spark plugs, boost gauge with mount, oil feed/drain lines, custom cam cover, tune files, hardware and gaskets.
- Requires Thundermax ECM (sold separately). Does not fit Twin Cooled or non-removable fairing lowers. Offroad use only.
- Made in the USA.
Die-cast cover accepts OEM-style time covers, gasket and hardware.
Two-piston kit with forged crowns, precision-fit rings, force-fed pin oiling and ArmorGlide® skirt coating for improved durability and sealing.
Die-cast aluminum cam cover; bushings installed to OEM specs. Includes oil seal, mounting hardware and gasket.
Durable forged piston kit with low-friction skirt coating; includes two pistons, rings, pins and circlips, made in the USA.
High-strength forged piston kit with ArmorGlide® skirt coating for reduced friction and improved scuff resistance. Includes pistons, rings, pins and circlips. Made in USA.
Premium forged pistons with precision-fit rings, force-fed pin oiling and ArmorGlide® skirt coating; complete kit with pins and circlips.
High-strength forged pistons with precision-fit rings, force-fed pin oiling and ArmorGlide® skirt coating; two-piston kit includes pins and circlips.
Forged pistons with generous valve pockets for big valves and cams.
Includes rings, piston pins and circlips for two pistons.
Force-fed pin oiling and a pressure-seal groove enhance sealing and durability.
High-performance piston kit with ArmorX™ and ArmorFit™ coatings for durability and quiet operation.
Includes pistons, rings, pins and circlips; fits OEM and Screamin’ Eagle cylinder heads.
High-performance piston kit with ArmorFit™ and ArmorX™ coatings for reduced wear, improved sealing and reliable fitment.
Sold as a kit for two heads and includes mounting hardware for straightforward installation.
Sold as a kit for two heads; includes mounting hardware for easy installation and a clean finished look.