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.
Precision cam shims for accurate valve adjustment. Made in the U.S.A.
Covers the gap between the transmission top cover and the engine cylinder for a finished look. Installs quickly and easily. Durable polished finish.
Smooths the transition from the cylinders to the engine cases for a clean finish. Easy installation with basic hand tools.
Direct-fit oil cooler cover that installs like the stock factory cover for a quick bolt-on upgrade.
Transparent cam cover that matches Assault series air cleaners and allows internal inspection. Made in the USA.
Transparent cover for viewing internal engine components. Matches the Assault series air cleaners. Made in the USA.
Transparent cover for viewing internal engine components; matches Assault series air cleaners. Made in the USA.
Precision-machined billet cap with improved heat transmission and performance styling.
Strong, lightweight billet aluminum point cover with CNC precision and improved heat transfer.
Direct-fit piston pin clips for many Harley models. Made in the USA and built to OEM-equivalent standards.
Precision-machined spacer for motor sprocket shafts. Made in the USA.
Precision support discs for motorcycle bearing assemblies. Durable steel construction with corrosion-resistant finish. Made in the U.S.A.
Replacement dowel pins for precise alignment and secure assembly.