Our exclusive Scavenger Series® X-Pipe kits mount ahead of the mufflers in place of a traditional H-pipe and generally provides a significant torque increase with a deep unique sound. Scavenger Series D-Port technology is four large D shaped ends of the tubing joining together to form a specific width opening and provides a much larger area for Scavenging exhaust gases and creating higher velocities vs. traditional X-pipes. These work very well on stock or modified applications including street cars, towing applications, drag racing, circle track racing and more.