JEGS Mustang X-Pipe design synchronizes the balance of exhaust pulses from each bank of cylinders based on the firing order. This synchronization increases velocity and scavenging from each cylinder for improved horsepower and torque. JEGS Mustang X-Pipe Kits are manufactured from fully aluminized 16-gauge, 2.5 in. mandrel bent tubing (except where noted) and include all necessary hardware.