Edelbrock part #2151 Performer Oldsmobile 455 intake manifold is designed for street 400-425-455 c.i.d. applications. Edelbrock's Patented Dual-plane, low-rise design with a 180-degree firing order greatly improves torque over a wide rpm range for excellent throttle response from off-idle through 5500rpm. This Performer intake manifold is ideal for passenger cars, trucks, 4x4s, tow vehicles and RVs. Includes exhaust crossover plugs #2733 which must be used for marine and off-road use.