Engine

Active filters
High-quality, fuel-resistant cover seal engineered for long-term reliability. Made in the USA.
- 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.
Comprehensive gasket kit with MLS head gaskets, Viton-coated base gaskets and AFM exhaust seals; made in the USA.
Complete gasket kit with MLS head gaskets, Viton-coated base gaskets, blue Viton valve stem seals, and AFM exhaust gaskets. Made in the USA. Includes motor gaskets plus primary, derby and inspection cover gaskets where applicable.
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.
Complete primary gasket kit for inner and outer primary assemblies. Aluminum-core gaskets with a nitrile outer layer resist temperatures above 205°F and offer about 85% shape recovery. Made in the USA. No gasket sealer required.
Forged aluminum piston kit with ArmorGlide® skirt coating; includes two pistons, rings, piston pins and circlips for a complete install.
Premium gasket pack offering multiple gasket types and advanced sealing technologies for reliable, fuel-resistant performance.
Forged aluminum piston kit with ArmorGlide® skirt coating; includes two pistons, rings, piston pins and circlips.
Premium rocker gasket made from fuel-resistant materials with a stainless steel core and Viton coating for lasting seal performance.