The Performer Manifolds are dual-plane, low-rise intake manifolds with a 80 degree firing order and patented runner design. This combination boosts torque over a wide RPM range, from off-idle all the way up to ,00 RPM. The Performers are ideal for passenger cars, boats, tow vehicles and RV's. These manifolds also deliver improved throttle response over stock intakes and are available in both EGR and non-EGR styles. They accept late-model choke, water neck, alternator, air conditioning brackets and have provisions for oil filler tube.