PRO CIRCUIT
Pro Circuit is a legendary name in motocross and off-road performance, producing high-performance motorcycle exhaust systems, silencers and racing engine components. Known for innovation and race-proven engineering, the brand develops Ti-6 titanium exhaust systems, T-6 stainless exhausts, Works pipes and R-304 silencers for professional and amateur riders. Pro Circuit components are designed to maximize horsepower, throttle response and overall engine efficiency.
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Pro Circuit - 1151912K - Ti-2 Silencer
PRO CIRCUIT
$446.95Pro Circuit - 18211900 - Ti-2 SilencerFeaturesOffers the "factory" look and appearance while reducing weightOptimum performance gainsCNC-machined aluminum mounting bracketFor closed-course racing...$446.95 -
Pro Circuit - 1151925K - Ti-2 Silencer
PRO CIRCUIT
$446.95Pro Circuit - 18211896 - Ti-2 SilencerFeaturesOffers the "factory" look and appearance while reducing weightOptimum performance gainsCNC-machined aluminum mounting bracketFor closed-course racing...$446.95 -
Pro Circuit - 1151912 - R-304 Silencer
PRO CIRCUIT
$206.29Pro Circuit - 18211899 - R-304 SilencerFeaturesThe compact design of the short aluminum canister offers optimum performance gains and is recommended for closed-course racing onlyHex head screws are...$206.29 -
Pro Circuit - FMS07250 - Fuel Mixture Screw - Honda/Kawasaki/KTM/Yamaha - Red
PRO CIRCUIT
$29.95Pro Circuit - 10500173 - Fuel Mixture Screw - Honda/Kawasaki/KTM/Yamaha - RedFeaturesPro Circuit's fuel mixture screw can be turned by hand (without the use of tools)Fits 4-strokes with Keihin pumper...$29.95 -
Pro Circuit - TB-05-A - Throttle Tube - CRF - Aluminum
PRO CIRCUIT
$79.95Pro Circuit - 06320856 - Throttle Tube - CRF - AluminumFeaturesStronger and more durable than OEM plastic unitsSpecsBase ColorBlackFor Handlebar Diameter Imperial7/8''MaterialAluminumRiding...$79.95 -
Pro Circuit - PC4009-0019 - Engine Plug Kit - Yamaha YZ 450F/250F
PRO CIRCUIT
$69.95Pro Circuit - 09401993 - Engine Plug Kit - Yamaha YZ 450F/250FFeaturesMachined from aircraft-grade aluminumPolished to a mirror finish, then anodized for a one-of-a-kind...$69.95 -
Pro Circuit - ICK20110 - Ignition Cover - Kawasaki KLX 110/L
PRO CIRCUIT
$63.00Pro Circuit - 09401985 - Ignition Cover - Kawasaki KLX 110/LFeaturesCNC-machined from aircraft quality aluminum for strength and durabilityAnodized for surface hardness and reduced normal...$63.00 -
Pro Circuit - TB-14 - Throttle Tube - CRF110 - Aluminum
PRO CIRCUIT
$79.95Pro Circuit - 06320865 - Throttle Tube - CRF110 - AluminumFeaturesStronger and more durable than OEM plastic unitsSpecsBase ColorBlackColor/FinishBlackColor/FinishFlatTypeThrottleFor Handlebar...$79.95 -
Pro Circuit - TB-13 - Throttle Tube - KLX - Aluminum
PRO CIRCUIT
$79.95Pro Circuit - 06320864 - Throttle Tube - KLX - AluminumFeaturesStronger and more durable than OEM plastic unitsSpecsRiding StyleOff-RoadBase ColorBlackFor Handlebar Diameter Imperial7/8''Product...$79.95 -
Pro Circuit - TB-12 - Throttle Tube - SX-F - Aluminum
PRO CIRCUIT
$93.95Pro Circuit - 06320788 - Throttle Tube - SX-F - AluminumFeaturesStronger and more durable than OEM plastic unitsSpecsBase FinishFlatColor/FinishBlackRiding StyleOff-RoadFor Handlebar Diameter...$93.95 -
Pro Circuit - KAB17 - Axle Blocks - Natural - KX 250F/450F
PRO CIRCUIT
$62.95Pro Circuit - 12310835 - Axle Blocks - Natural - KX 250F/450F Features CNC-machined from billet aluminum for strength and light weight Specs Color/Finish Hard...$62.95 -
Out of stock
Pro Circuit - HPA17450 - Linkage Arm - 146 mm - Honda - CRF450R/RX
PRO CIRCUIT
$224.95Pro Circuit - 13020649 - Linkage Arm - 146 mm - Honda - CRF450R/RXFeaturesThis will also help eliminate the initial loose and wallowy feelTurning and cornering capabilities are greatly improved as...$224.95 -
Pro Circuit - WPK17250 - Water Pump Cover with Impeller - Kawasaki
PRO CIRCUIT
$239.95Pro Circuit - 09401611 - Water Pump Cover with Impeller - KawasakiFeaturesStrong, lightweight and durable to provide years of outstanding protection and performanceDesigned with an impeller to...$239.95 -
Pro Circuit - PC4009-0015 - Oil Filter Cover - Kawasaki
PRO CIRCUIT
$39.95Pro Circuit - 09401492 - Oil Filter Cover - KawasakiFeaturesPolished to a mirror finish, then anodized for a one-of-a-kind lookSpecsColor/FinishMirrorProduct...$39.95 -
Pro Circuit - CSH21450-CS - Clutch Springs - CRF 450R
PRO CIRCUIT
$79.95Pro Circuit - 11313719 - Clutch Springs - CRF 450RFeaturesMore positive clutch engagementPrevent clutch slippingConsistent spring performanceControl how efficiently your clutch turns power into...$79.95 -
Pro Circuit - SPA18450 - Linkage Arm - 136 mm - Suzuki - RM-Z250/RM-Z450
PRO CIRCUIT
$316.95Pro Circuit - 13020653 - Linkage Arm - 136 mm - Suzuki - RM-Z250/RM-Z450FeaturesThis will also help eliminate the initial loose and wallowy feelTurning and cornering capabilities are greatly improved...$316.95 -
Pro Circuit - CSY19250-CS - Clutch Springs - YZ 250F
PRO CIRCUIT
$83.95Pro Circuit - 11313380 - Clutch Springs - YZ 250FFeaturesMore positive clutch engagementPrevent clutch slippingConsistent spring performanceControl how efficiently your clutch turns power into...$83.95 -
Pro Circuit - 2312101 - Shift Shaft Brace - CRF110F
PRO CIRCUIT
$59.95Pro Circuit - 11100096 - Shift Shaft Brace - CRF110FFeaturesThe plastic countershaft sprocket cover will need some custom cutting for the shift shaft brace to fit properly.SpecsRiding...$59.95 -
Out of stock
Pro Circuit - 0151925G - T-6 Exhaust
PRO CIRCUIT
$990.95Pro Circuit - 18201891 - T-6 ExhaustFeaturesComes with a removable United States Forest Service (USFS) Approved Spark Arrestor making it easy to alternate between off-road and closed course...$990.95 -
Pro Circuit - 0351925FP - Ti-6 Pro Exhaust
PRO CIRCUIT
$1,269.95Pro Circuit - 18201882 - Ti-6 Pro ExhaustFeaturesCreated as a full race system, the Ti-6 Pro is designed to increase performance and help professional racers pass AMA/FIM sound regulationsSpecsRiding...$1,269.95 -
Out of stock
Pro Circuit - CSS12085 - Clutch Springs - RM 85
PRO CIRCUIT
$72.95Pro Circuit - 11312427 - Clutch Springs - RM 85FeaturesMore positive clutch engagementPrevent clutch slippingConsistent spring performanceControl how efficiently your clutch turns power into...$72.95 -
Out of stock
Pro Circuit - CSH18250-CS - Clutch Springs - CRF 250R
PRO CIRCUIT
$69.95Pro Circuit - 11313265 - Clutch Springs - CRF 250RFeaturesMore positive clutch engagementPrevent clutch slippingConsistent spring performanceControl how efficiently your clutch turns power into...$69.95 -
Out of stock
Pro Circuit - 0151635A - T-6 Muffler
PRO CIRCUIT
$649.95Pro Circuit - 18211729 - T-6 MufflerFeaturesConstructed of stainless steel throughout the mid-pipe and end-cap while the canister is constructed of aluminum for increased durabilityMachined aluminum...$649.95 -
Pro Circuit - 0151545A - T-6 Muffler
PRO CIRCUIT
$649.95Pro Circuit - 18211699 - T-6 MufflerFeaturesConstructed of stainless steel throughout the mid-pipe and end-cap while the canister is constructed of aluminum for increased durabilityMachined aluminum...$649.95 -
Out of stock
Pro Circuit - 0121365A - T-5 Mechanical Muffler - Stainless Steel - KLR650
PRO CIRCUIT
$590.95Pro Circuit - 18211532 - T-5 Mechanical Muffler - Stainless Steel - KLR650FeaturesThe T-5 Stainless Slip-On Silencer is designed for a rider looking for an inexpensive, easy-to-install, lightweight...$590.95 -
Pro Circuit - 0821185 - Platinum Head Pipe
PRO CIRCUIT
$352.95Pro Circuit - 18201304 - Platinum Head PipeFeaturesUnique nickel bath technology gives the surface added abrasion resistance and enhances the aesthetic lookStamped AKDQ high-quality carbon steel...$352.95 -
Out of stock
Pro Circuit - 0751125 - Works Pipe
PRO CIRCUIT
$349.95Pro Circuit - 18201252 - Works PipeFeaturesDurable construction conforms to the natural shape of the motorcycle for exceptional fit and performanceReinforced brackets and stingers prevent cracking,...$349.95 -
Pro Circuit - 0951125 - Platinum 2 Pipe
PRO CIRCUIT
$365.95Pro Circuit - 18201250 - Platinum 2 PipeFeaturesInnovative design helps with increased bottom to mid-range power, making it perfect for unique styles of ridingNickel-plated finish to prevent...$365.95 -
Out of stock
Pro Circuit - PY02085P - Platinum Head Pipe
PRO CIRCUIT
$352.95Pro Circuit - PY02085P - Platinum Head PipeFeaturesUnique nickel bath technology gives the surface added abrasion resistance and enhances the aesthetic lookStamped AKDQ high-quality carbon steel...$352.95 -
Out of stock
Pro Circuit - PY01125P - Platinum Head Pipe
PRO CIRCUIT
$352.95Pro Circuit - PY01125P - Platinum Head PipeFeaturesUnique nickel bath technology gives the surface added abrasion resistance and enhances the aesthetic lookStamped AKDQ high-quality carbon steel...$352.95 -
Pro Circuit - 4H04650 - T-4 Exhaust
PRO CIRCUIT
$943.95Pro Circuit - 18200185 - T-4 ExhaustFeaturesExtensively track- and dyno-testedSteel Allen head screws make repacking an easy taskExclusive E-glass pillow packingIncludes USFS-approved spark arrestor...$943.95 -
Pro Circuit - SS91250-304 - 304 Silencer
PRO CIRCUIT
$205.95Pro Circuit - SS91250304 - 304 SilencerFeaturesLonger body design helps to reduce noise output6061 T6 brushed aluminum silencer bodyStainless steel inlet tube and end-capTig and mig welded for...$205.95 -
Pro Circuit - PH05250 - Works Pipe
PRO CIRCUIT
$349.95Pro Circuit - 18200180 - Works PipeFeaturesDurable construction conforms to the natural shape of the motorcycle for exceptional fit and performanceReinforced brackets and stingers prevent cracking,...$349.95 -
Out of stock
Pro Circuit - PY00250P - Platinum Head Pipe
PRO CIRCUIT
$393.95Pro Circuit - PY00250P - Platinum Head PipeFeaturesUnique nickel bath technology gives the surface added abrasion resistance and enhances the aesthetic lookStamped AKDQ high-quality carbon steel...$393.95 -
Out of stock
Pro Circuit - PS99250P - Platinum Head Pipe
PRO CIRCUIT
$407.95Pro Circuit - PS99250P - Platinum Head PipeFeaturesUnique nickel bath technology gives the surface added abrasion resistance and enhances the aesthetic lookStamped AKDQ high-quality carbon steel...$407.95 -
Out of stock
Pro Circuit - SK99250-RE - R-304 Silencer
PRO CIRCUIT
$206.29Pro Circuit - SK99250RE - R-304 SilencerFeaturesThe compact design of the short aluminum canister offers optimum performance gains and is recommended for closed-course racing onlyHex head screws are...$206.29 -
Pro Circuit - SK95200D-SE - 304 Silencer
PRO CIRCUIT
$205.95Pro Circuit - SK95200DSE - 304 SilencerFeaturesLonger body design helps to reduce noise output6061 T6 brushed aluminum silencer bodyStainless steel inlet tube and end-capTig and mig welded for...$205.95 -
Pro Circuit - SK92125-304 - 304 Silencer
PRO CIRCUIT
$205.95Pro Circuit - SK92125304 - 304 SilencerFeaturesLonger body design helps to reduce noise output6061 T6 brushed aluminum silencer bodyStainless steel inlet tube and end-capTig and mig welded for...$205.95 -
Pro Circuit - PT03250 - Works Pipe
PRO CIRCUIT
$349.95Pro Circuit - PT03250 - Works PipeFeaturesDurable construction conforms to the natural shape of the motorcycle for exceptional fit and performanceReinforced brackets and stingers prevent cracking,...$349.95 -
Pro Circuit - PT00250P2 - Platinum 2 Pipe
PRO CIRCUIT
$365.95Pro Circuit - PT00250P2 - Platinum 2 PipeFeaturesInnovative design helps with increased bottom to mid-range power, making it perfect for unique styles of ridingNickel-plated finish to prevent...$365.95
Pro Circuit Performance Exhaust Systems – Motorcycle Exhausts, Racing Engine Components & Power Upgrade Kits
Pro Circuit has built a global reputation as one of the most influential brands in motocross and off-road motorcycle performance engineering. The company designs race-proven components that enhance engine output, throttle response and overall riding performance. Their product lineup includes advanced motorcycle exhaust systems, titanium silencers and precision-machined performance parts used by professional race teams and enthusiasts alike.
Among the brand’s most recognized products are the Ti-6 Pro titanium exhaust systems, T-6 stainless steel exhaust systems and Works Pipe performance expansion chambers. Riders also rely on R-304 silencers, spark arrestor silencers and Platinum series exhaust pipes designed to optimize power delivery across various engine platforms. In addition to exhaust solutions, Pro Circuit manufactures a range of racing components including clutch springs, water pump covers, linkage arms, axle blocks and throttle tubes that support durability and precision performance in competitive riding conditions.
Beyond exhaust technology, Pro Circuit provides performance-focused upgrades that enhance both engine reliability and chassis control. Products such as ignition covers, shift levers, clutch covers and fuel mixture screws help riders fine-tune their machines for optimal efficiency and responsiveness. Whether installing a motocross performance exhaust, upgrading engine hardware or improving throttle control with precision components, Pro Circuit continues to deliver race-developed solutions trusted by professional riders and off-road enthusiasts worldwide.