A-1 Performance Class 11 Sidewinder Header & Muffler 1 1/2" #SW112-11-AWM

Maximum Clearance. Maximum Performance.

The A1 Class 11 Exhaust System is engineered for drivers who refuse to compromise. Whether you're building a dedicated off-road machine or running an ultra-low street car, this compact system delivers serious horsepower gains without sacrificing fitment.

Built for Two Worlds:

Off-road ready - designed to maximize ground clearance for Class 11 competition and trail use. Street fitment - tucks neatly behind the apron on ultra-low cars where space is at a premium.

Premium Construction:

T304 stainless steel throughout. Fully TIG welded for a clean, seamless finish. Smooth mandrel bends for optimized flow. V-band connector between header and muffler for easy installation and a secure seal.

Complete Kit:

Every Class 11 kit includes both the header, muffler and V-band clamp - everything you need, nothing you don't.