Pro-Circuit is a name you are familiar with if you follow supercross or motocross just about anywhere in the world. Their racing record since boss Mitch Payton started the Pro-Circuit Supercross / Motocross team almost 20 years ago is second to none.

Some of their team riders include AMA Supercross and Motocross Champions Jeremy McGrath, Ricky Carmichael, and Ryan Villopoto. And riders that have used their products include just about every name rider ever.

One of their best selling and coolest products going is the Pro-Circuit 4-stroke exhaust systems. They boost overall performance with explosive bottom, mid range and peak power. And because they’re constructed to withstand event the most abusive conditions, these systems are sure to give you years of unrivaled performance off-road or on the track.

  • Pro Circuit’s newest systems offer top-of-the-line performance and power
  • Complete systems from front to back
  • Ti-4 GP systems feature high-quality grade-two aerospace titanium throughout to provide huge weight savings and unique highlights
  • T-4 GP systems feature an aluminum canister and high-grade stainless steel mid-pipe
  • Both models are packed with performance features tailored to the demands of serious racers and developed to lower and centralize the machine’s center of gravity, which improves handling and critical clearances
  • In addition to an instant hook-up under power, the systems also offer huge horsepower gains across the RPM range
  • Each model has been rigorously track- and dyno-tested to yield peak performance


  • Inspired by the T-4, the Ti-4 system utilizes high-quality grade-two aerospace titanium to provide huge weight savings and unique highlights
  • Advanced design ensures lightning-quick throttle response and faster, stronger response during hard acceleration
  • CNC-machined modular end-cap design provides tunable power, with effortless reshaping to the machine’s powerband
  • Extensively track and dyno-tested
  • Silencers include wire-meshed spark arrester that can be removed for closed-course racing
  • Steel Allen head screws make repacking an easy task
  • Exclusive E-glass pillow packing
  • Complete systems come with stainless steel header
  • Can be used with OEM stock or a Pro Circuit header


  • Improved power delivery and exhaust note
  • Body is made from lightweight 6061 T-6 brushed aluminum and the end cap and intake tube are stainless steel
  • Tunable end caps allow fine-tuning of power delivery for different types of riding and terrain
  • Silencers include wire-meshed spark arrester that can be removed for closed-course racing
  • Steel Allen head screws make repacking an easy task
  • Complete systems include stainless steel header
  • Exclusive E-glass pillow packing


  • Revolutionary new system uses a longer aluminum body and special internal E-glass packing to lower noise output to legal dB without sacrificing power
  • Produces an impressive gain in horsepower when compared to OEM
  • Stainless steel intake tube and FIM-approved end cap
  • Completely hand-assembled and -welded for a fit and finish that would rival any Factory Works part
  • Lightweight aluminum mounting brackets
  • Wire-meshed removable spark arrester
  • Modular end caps for tunable power


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