Pro Circuit

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...

The 304 silencer is recommended for most two-stroke applications. The slightly longer body offers reduced noise output when compared to the R-304. The brushed aluminum body, stainless steel inlet...

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...

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...

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

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...

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...