I have a 78 T/A with a complete RAIII and RAIII manifolds. In the 80's my car would blow exhaust manifold gaskets constantly. I tried every kind of gasket to no avail. I always thought I needed to bring the manifolds to a machine shop to have them cut. I came across a set of Flow Master two chamber mufflers and put them on. I never blew another manifold gasket again, its been 40 years. Point is, Turbo mufflers not as free flowing as one would think.
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1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars
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