LA Choppers Chrome Vortex Torque Cones LA-1300-02 High temparature stainless steel cones have fully radiused edges for improved engine response, especially low-end torque Generate correct levels of backpressure for increased horsepower Fully radiused edges for improved engine response, especially low-end torque Fit most stock and aftermarket exaust sytems; fit 11/2-13/4 I.D. exhaust pipes New Vortex design increases back pressure, improving torque and horsepower