Clutch covers are CNC machined from T-6 billet aircraft-grade aluminum to improve durability and heat dissipation, which improves performance.

The compact design of the R-304 Silencer offers optimum performance gains and is recommended for closed-course racing only. Hex head screws are used to secure the inlet cap and can be removed easily for quick re-packing of the silencer.

Replacement Pro-Circuit exhaust decals help keep your muffler looking fresh

Replacement Pro-Circuit exhaust decals help keep your muffler looking fresh

Replacement Pro-Circuit exhaust decals help keep your muffler looking fresh

The T-4 System is a tunable version of our more exotic Ti-4R System. RC-4 Resonance Chamber has been added to the head pipe to reduce noise. (The RC-4 Resonance Chamber, depending on year of your bike, might not come with the system.)

A must-have item for any off-road motorcycle, stock or modified. You will benefit from increased clutch life with our high performance springs.12-15% stiffer than stockMore positive clutch engagementPrevents clutch slippingConsistent spring performance

Replacement Pro-Circuit exhaust decals help keep your muffler looking fresh

Replacement Pro-Circuit exhaust decals help keep your muffler looking fresh

A must-have item for any off-road motorcycle, stock or modified. You will benefit from increased clutch life with our high performance springs.12-15% stiffer than stockMore positive clutch engagementPrevents clutch slippingConsistent spring performance

Replacement Pro-Circuit exhaust decals help keep your muffler looking fresh

Replacement Pro-Circuit exhaust decals help keep your muffler looking fresh

Replacement Pro-Circuit exhaust decals help keep your muffler looking fresh

Replacement Pro-Circuit exhaust decals help keep your muffler looking fresh

Replacement Pro-Circuit exhaust decals help keep your muffler looking fresh

Unparalleled performanceIncrease in horsepower and torque gains will be noticed across rpm rangeElectroless nickel plating increases part life 2-10x longerStamped AKDQ high quality carbon steelHand welded and pounded seams* requires Pro Circuit...

The original Pro Circuit Works pipe offers unparalled performance and power for every two-stroke application. Increased horsepower and torque gains will quickly be noticed across the entire rpm range. The unplated, oiled metal finish requires some...

The Ti-6 Titanium Exhaust System is designed to improve performance and power over previous designs. Constructed of titanium throughout the head pipe, mid pipe and canister, this is the ideal exhaust for any off-road or closed course racer looking for...

The T-6 Stainless Steel Exhaust System offers the same benefits as our popular Ti-6 Titanium Exhaust System, but the T-6 is constructed of stainless steel and aluminum for increased strength and durability while giving riders a more affordable...

Each water pump assembly has been CNC-machined from billet aluminum and is color anodized. The Pro Circuit Water Pump Impeller has been designed to increase the pumping capacity and pressure head to reduce cavitation and increase cooling system...

The T-6 Stainless Steel Exhaust System offers the same benefits as our popular Ti-6 Titanium Exhaust System, but the T-6 is constructed of stainless steel and aluminum for increased strength and durability while giving riders a more affordable...