Details:Generate correct levels of backpressure for increased horsepower. Fully radiused edges for improved engine response, especially low-end torque. For use with stock or aftermarket exhaust systems. For 1 1/2" to 1 3/4" ID exhaust pipes. Sold in pairs. Made in the U.S.A.
Details:Allows you to open up your exhaust for straight-through flow by simply turning a screw. Slight power gains when used on modified motors. 4" diameter. Sold each. Made in the U.S.A.