PaceSetter 82-1146 Off Road Cross-Over Pipe Fits only #70-3230 and 72C3230 Quik Trip Long Tube Headers for 96-04 Mustang GT 4.6L and #70-3229 and 72C3229 for 96-04 Mustang Cobra, 4.6L. 2-1/2" diameter, 16-gauge for durability No special tools required for installation All required fasteners included For racing only