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.
Complete two-piston kit with precision-fit rings and enhanced pin oiling for dependable sealing and long life.
Forged, precision-fit piston kit with ArmorGlide® skirt coating and force-fed pin oiling. Value-pack includes two pistons, rings, pins, and circlips.
Forged aluminum piston kit with ArmorGlide® skirt coating; includes two pistons, rings, piston pins and circlips for a complete install.
Forged aluminum piston kit with ArmorGlide® skirt coating; includes two pistons, rings, piston pins and circlips.
Forged performance replacement for stock hydraulic roller lifters. 100% tested and made in the U.S.A.
Mounts S&S E/G or Keihin CV style air cleaners to Mikuni HSR 42/45 carburetors. Made in the USA.
Compact crankcase vent filter for reliable ventilation and easy installation.
Includes rings for one piston only. Fits only matching pistons. Check service manual for installation specs.
Set includes rings for one piston; fits matching pistons only.
Forged high-silicon aluminum piston kit with X-Ring package; includes rings, retainer clips and chrome piston pins. Made in the USA.