Pro Circuit Parts

Pro Circuit — Championship-Proven Exhaust & Engine Technology

### Brand Heritage & The Winning Tradition Founded in 1978 by former professional motocross racer and master engine tuner Mitch Payton in Anaheim, California, Pro Circuit has grown from a humble Husqvarna tuning shop into the most successful privateer and factory-supported racing organization in the history of motocross. With over 300 AMA Supercross and National Motocross main event victories and more than 30 AMA National Championships under the Monster Energy Pro Circuit Kawasaki banner, the brand represents the ultimate standard in horsepower development, chassis tuning, and championship execution.

Every product developed by Pro Circuit is born in the heat of professional Supercross competition. Mitch Payton and his dedicated team of engineers, machinists, and dyno technicians design, prototype, and manufacture all exhaust systems, engine components, and suspension linkages in-house at their state-of-the-art facility in Corona, California. Pro Circuit's philosophy is simple: build components that win races at the highest level of professional motorsport, and make that exact same technology available to every rider worldwide.

• Ti-6 Pro Full Titanium Exhaust Systems: Full titanium competition exhaust systems engineered to meet strict AMA/FIM professional sound regulations (112 dB) with maximum horsepower and weight reduction.
• T-6 Stainless Steel Exhaust Systems: High-durability stainless steel headers and aluminum canisters providing identical power gains to the Ti-6 line with added roost and crash resistance.
• 304 Factory Sound & R-304 Shorty Silencers: Legendary two-stroke silencers extruded from 6061-T6 aluminum with stainless steel inlet stingers and CNC-machined end caps.
• Works & Platinum 2-Stroke Expansion Chambers: Hand-welded two-stroke exhaust pipes stamped from high-grade carbon steel for explosive powerband broadening.
• Billet Aluminum Suspension Linkage Arms: Extended CNC-machined linkage arms that optimize rear suspension rising rates, lower chassis height, and improve cornering traction.
• Billet Engine Plugs, Launch Controls & Hard Parts: Precision-machined racing accessories engineered for maximum reliability under race conditions.

### How Pro Circuit Transforms Stock Performance 1. Exhaust Scavenging & Power Delivery: Factory OEM four-stroke exhaust systems are designed to balance strict emissions, sound limits, and low production costs, resulting in narrow headers and restrictive baffles that choke high-RPM over-rev. Pro Circuit Ti-6 and T-6 systems utilize precision-stepped header diameters and RC-4 resonance chambers that optimize exhaust gas velocity, delivering explosive bottom-end throttle response, massive mid-range punch, and endless top-end over-rev. 2. Chassis Balance & Suspension Progression: Stock rear suspension linkages often feature an overly aggressive rising-rate curve that causes the rear end to feel harsh on braking bumps and ride high into turns. The Pro Circuit linkage arm extends eye-to-eye pivot length, lowering the rear ride height by 5-10mm, placing more traction onto the rear tire, and smoothing out the initial shock stroke for supreme stability over rough chop. 3. Weight Reduction: Replacing a heavy OEM exhaust with a Pro Circuit Ti-6 Pro full titanium system eliminates between 2.0 and 3.5 pounds of high-mounted weight, significantly improving the motorcycle's flickability and corner turnover agility.

### Aerospace Craftsmanship & Acoustic Engineering Pro Circuit exhausts are hand-TIG welded by master craftsmen in Corona, California, using aerospace-grade titanium and high-tensile 304 stainless steel. The silencers feature internal perforated steel cores wrapped in exclusive high-density fiberglass pillow packing that withstands extreme exhaust temperatures without premature blowout. All Pro Circuit systems are rigorously tested on calibrated inertia dynos and verified under real-world race conditions by factory team riders.

• Silencer Repacking: Repack four-stroke silencers every 20-30 hours and two-stroke silencers every 15-25 hours using genuine Pro Circuit Pillow Packing to maintain power, preserve sound compliance, and prevent canister heat discoloration.
• Header Care: Clean raw titanium headers with rubbing alcohol before initial startup to remove skin oils that can stain the titanium. Stainless steel headers can be cleaned with Scotch-Brite to maintain their bright metallic luster.
• Linkage Greasing: Disassemble and re-pack the needle roller bearings in your Pro Circuit linkage arm with waterproof synthetic grease every 20-30 operating hours.

Frequently Asked Questions