Hi,
I bought a 2.5" X-Pipe complete system from Pypes for my 462 cid, 68 GTO with log exhaust manifolds. I'm very happy with it so far. Car is a M20 four speed. No clearance problems, not overly loud. I had it installed by a muffler shop on an overhead lift. Quick and easy. All pipe connections were clamped.
With RA exh manifolds and HO, you will probably gain a little HP from improved flow and less backpressure.
Mike
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1968 Pontiac GTO 462CID, 4-Speed Manual, 3.55 rear. Aleutian Blue exterior, 219 Teal Blue interior. Chrome bumper, AM & 8-Track and Rally II Wheels
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