This muffler fits the A1 Sidewinder System utilizing flanged heater boxes. Please choose early or late bus (68 - 71) Early model clears reduction boxes and all factory engine tin. Late bus model clears the rear hanger bar and all the factory engine tin.  

Competition sidewinder mufflers use A1's exclusive 'magna flo' muffler design built to A1's specifications, incorporating a full 2 1/2" hi-flo straight through core design and constructed in 409 stainless steel with the inlet and outlet on the same end cap for fitment versatility. This design and construction will allow the muffler to flow equally to that of an open stinger upwards of 220HP, yet allows a clean even exhaust note and achieving a noise level under 90 decibels (sound levels may vary due to engine horsepower). Numerous 11 and 12 second quarter mile street/drag cars have achieved excellent performance results with these mufflers.

Available in ceramic coated tubing or stainless tubing please choose above.