BBK 14-18 GM Truck 5.3/6.2 1 3/4in Shorty Tuned Length Headers - Polished Silver CeramicThese BBK Performance shorty tuned Length exhaust Headers are designed and constructed as direct fit replacements for all 14 18 Chevrolet GM 5. 3 6. 2 Full Size Truck applications. Each header is manufactured with 1 3 4 in. CNC mandrel bent tubing that offers unrestricted exhaust flow for increased horsepower and torque over factory OEM manifolds. BBK tuned Length headers offer improved scavenging waves for better combustion, which leads to improved