The Edelbrock Performer Air-Gap Intake Manifold features the air-gap design for the ultimate street performance in the idle to 5, 500 RPM range. This manifold is dual-plane, low-rise intake manifolds with a 180 degree firing order and patented runner design that is not available in other brands. Torque and horse power are increased. The air-gap design features an open air space that separates the runners from the hot engine oil resulting in a cooler, denser charge for more power. The high-velocity runners deliver excellent throttle response throughout the power band. The great looks of the Performer air-gap along with the solid idle to 5, 500 RPM performance makes this an ideal choice for street rods and street machines. There is no provision for exhaust heated chokes or exhaust crossover.