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exhaust flow

  1. Another exhaust question. what did i do wrong

    Titan Performance Modifications
    Ok gents help me out. i found this clip on youtube of a T with an h pip secondary cats elim and true dual fm super 40s. i loved it. so i tried it. i went with an x pipe instead of an h pipe and i gutted the cats but didnt eliminate them. my T is not near as loud. What gives?? could the diameter...
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