The powerful TRX® 3.3 racing engine with IPS shaft delivers unbeatable performance on or off the track. The engine features a precision composite slide carburetor, PowerTune™ cooling head, dyno-proven IPS crankshaft, and multi-port rear exhaust. Years of testing and proven performance deliver the easiest-to-tune, most dependable, most powerful Ready-To-Race® engine available. It's competition-proven power with convenience and reliability for all-day driving fun.