The product of state-of-the-art technology and extensive real-world testing, Pro Circuit 4-stroke systems boost overall performance with explosive bottom, mid-range and peak power. And because they’re constructed to withstand even the most abusive conditions, these systems are sure to give you years of unrivaled performance off road or on the track.
TI-4
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 arrestor that can be removed for closed-course racing
Steel Allen head screws make repacking an easy task
Exclusive E-glass pillow packing
Can be used with OEM stock or a Pro Circuit header
T-4
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 arrestor that can be removed for closed-course racing
Steel Allen-head screws make repacking an easy task
