UPR Products direct fit X-over Pipe requires nothing but a quick and easy installation. Features aluminum steel construction and a true X-over pipe design unlike other who use a box or stamped steel design. UPR's X-over pipe will add as much as 20+ HP. We are the manufacturer and one of the pioneers of the X-over pipe. They have been using this design on every race and street car application since late 1995. A must for all 4.6L 3V engines naturally aspirated and power adder equipped.