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  1. Exhaust is way too quite

    6.4 Motor Problems
    Ive had 2 6.4s before the one I currently have now. Both of the ones before had 5" turbo back exhaust straight piped. I have just recently bought another one that already had a 5" magnaflow straight pipe. For some reason, it sounds like it doesn't even have a straight pipe on it. It drives...
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