RM-4-OS pair, Round Port, high flow factory headers, Gray ceramic coated

Pair, (LH and RH) Ram Air Round Port Manifolds with Larger Collector Fits 68-79 GM A-body; 70 1/2-81 F-Body; 69-85 G-Body, 71-81 B-Body with these heads: RA II, RA IV, 455 HO, 455 SD, Edelbrock heads. Collector size is 2.40" for cars with "large pipe" exhaust systems and/or intake/head mods. The larger collector gives 14-16% more flow capability than stock collector castings. Lifetime warrantee on material and workmanship!

Manifolds are 455SD design (the largest Round Port design).

LH requires 2 bolt flange, RH requires 3 bolt flange (sold sererately) (FL-1-OS and FL-2-OS) If you order flanges with ceramic coated factory headers we provide ceramic coating on flanges at no charge.

GET $25.00 OFF WHEN YOU ORDER OUR X-CROSSOVER EXHAUST SYSTEM WITH OUR FACTORY HEADERS!

Recommend using with our 2.5" mandrel bent downpipes SHP-6