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  1. 3.5 inch straight pipe stock exhaust vs 4 inch aftermarket

    99-03 7.3L Performance Parts
    Fellas, I'm a new guy on here and I have a late '99 7.3. Its all stock except the previous owner cut off the muffler and put a patch in the exhaust pipe. I'm wanting to do the 6637 intake mod pretty soon and a chip eventually. My goal is more power and fuel efficiency. One of my buddies with a...
  2. 5" straight pipe muffler delete??

    6.4L Performance Parts Discussion
    I have a 5" straight pipe with a muffler that I want to take out. Is there any cheap routes of doing this?? Thanks
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