High-temperature stainless steel cones have fully radiused edges for improved engine response, especially low-end torque Generate correct levels of backpressure for increased horsepower Fit most stock and aftermarket exhaust systems; fit 1-3/4"-2" i.d. exhaust pipes Smooths out the power curve for more consistent performance Made in the U.S.A.. TORQUE CONES 1.75-2"