This header is engineered to offer both premium fitment and maximum performance from your 4.0L L6 engine. Max dyno gains of +4 HP & +7 LB. 1-1/2 diameter tuned length primary tubes feature smooth transition, 6-2-1 design for increased exhaust flow, improved throttle response and a broad torque curve.
Utilizes true mitered merge collectors designed to maximize exhaust velocity and scavenging for optimum performance. Constructed from heavy duty 14-gauge, stainless steel for increased strength and durability. Uses 1/2 thick head flange for durability and an optimum sealing surface. Retains factory O2 sensors and catalytic converters.
100% bolt-on with NO cutting necessary for a hassle-free installation. Quality welds for strength, longevity and good looks. Performance-Curve is a retail / wholesale warehouse distribution center with over 50 years of experience! We feature eight warehouses across the East Coast.The item page will indicate which service is used for that specific item.