Lou, In what issue of Hotrod was that test published? What are the differences between Muffler Man's X pipe and the Dr. Gas X product? Are you saying the MM's X pipe is as good as open headers? Your latest posts seem a little contradictory to your earlier ones. Are you saying that the MM X pipe is worth that much HP increase with everything else being equal? I ( hopefully ) will be needing an exhaust system soon for the Firebird and I want what will give me the most horsepower.
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Maurice
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