One of the first things you do to improve performance on your 1964-1972 GM A-Body is to upgrade the exhaust. Flowmaster's American Thunder dual exhaust kits will give you the ultimate in performance and sound.
Includes aluminized 16-gauge mandrel bent pipes from the crossmember back, H-pipe, Super 40 Series Mufflers and hardware. Ships in two boxes. 2-1/2".