- High-flow 2.250" chrome moly gerotor gears for increased oil volume
- Precision-machined relief valve; bench tested to seat at 30 psi, pop-off 55–60 psi
- 42% more scavenge volume and 68% more oil to bearings versus stock
- Magnet protection and corrected passages to reduce wet sumping and blow-by
- Requires matching high-flow cam plate (part #0932-0192) for optimized scavenge
Active filters
Replacement spring and plunger assembly for oil pump pressure relief valve — increases pop‑off psi and restores proper bypass control. Bench‑test with PART #3801-0071.
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.
Precision J-form cylinder stud kit with eight studs, moly assembly lubricant, and thread sealant. Stock replacement and reusable; manufactured by ARP® in the USA.
Reduces rocker arm end play and engine noise. Recommended side clearance: 0.0035" - 0.005". Helps limit wear on M8 rocker standoffs. Professional installation required. 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.
- Wide 2500–6900+ RPM power range
- Requires carburetor/throttle body tuning and performance exhaust/intake
- High-performance valve springs, pushrods and lifters required
- Made in the USA
Complete camshaft installation kit with quick change gaskets and premium roller bearings for reliable camplate service.
Pair of precision pins that ensure correct press fit when servicing Twin Cam chain drive cam plates and tensioners.