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  1. 1964-1974 Tempest, Lemans & GTO Engine Compartment
    I've viewed the comparisons in several threads, but I am genuinely curious to know what the sound difference between the RAR manifolds and, let's say, Doug's long tube headers. I'm at a crossroads---to be honest I would sacrifice fitment and headaches if there was a large disparity in sound...
  2. 1964-1974 Tempest/Lemans/GTO Exhaust/Susp/Brakes
    Hello everyone, This question was actually asked 8 years ago, but I did not find a response. I ordered the Ram Air Restorations oversized manifolds for my 67 GTO with a 400. RAR doesn't mention it, but on Butlers website there is a note that states, " WILL NOT FIT 1964-67 FRAME WITHOUT...
  3. 1964-1974 Tempest, Lemans & GTO General Discussion
    Hello everyone. I recently purchased a 1967 GTO. The car originally had a 400ci with 335 hp “YS” code with an automatic transmission. However it now has a 455ci the engine based on the numbers next to the timing cover (starting with 22P) it was originally in a 1972 Pontiac. This 455ci has “YC”...
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