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You don't want a lot of back pressure. You really don't want any at all thats why they make straight pipes with no cat, resonator or muffler. Back pressure is air built up in the pipes (muffler) that keeps air from escaping due to a build up of pressure. The muffler is what it is which is basically a sound canceller. I have a muffler delete and love it. I thinking about deleting one of the resonators to get more of a raspy tone. Where did you get the x pipe?
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