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.