LA Choppers Vortex Torque Cones High-temperature stainless steel cones have fully radiused edges that smooths out the power curve for improved engine response, especially low-end torque. Features: New vortex design allows increases back pressure improving torque and horsepower Smooths out your power curve, providing for a more consistent performance Fully radiused edges for improved engine response and low-end torque For use with most stock and aftermarket exhaust systems Easy to install - slips right in place Made in the USA