Blow Performance three-step exhaust systems are designed to work with the exhaust inertia pulse and give a broad power band on 80CI – 131CI Evolution Big Twin and Twin Cam engines. Three-step headers are not be confused with straight drag pipes. These are true High Performance exhaust systems for closed course competition. Blow Performance encourages having your engine dyno tuned after installation by a professional dyno tuner for maximum performance.

Note: Except where mentioned differently, all exhaust systems, mufflers, drag-pipes, etc. shown in our catalog, are for closed course competition or in show competition only. They will not meet legal noise and emission standards.