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    Thread: 2.5 vs 3

    1. #1
      Join Date
      Dec 2011
      Location
      new york
      Posts
      367
      Country Flag: United States

      2.5 vs 3

      Good afternoon everyone,

      I broke a hangar on my exhaust and unfortunately, I think that might be the last straw for this system.

      Car is a g body with an NA LS3/tremec magnum. On the dyno the car made 500.1/475 at 5900/4xxx to the tire through a 2.5" exhaust.

      Now that its time to redo the exhaust, I'm looking for opinions on 2.5" vs 3" pipe. Thank you



    2. #2
      Join Date
      Mar 2020
      Posts
      199
      At your power level a 3" should be of benefit, but I'm not sure what system you presently run or the noise level you are accustomed to.

      3" pipes tend to be louder, so there is a tradeoff.

    3. #3
      Join Date
      Dec 2011
      Location
      new york
      Posts
      367
      Country Flag: United States
      Quote Originally Posted by Lonnies Performance View Post
      At your power level a 3" should be of benefit, but I'm not sure what system you presently run or the noise level you are accustomed to.

      3" pipes tend to be louder, so there is a tradeoff.

      Thank you. Current system is 2.5" with an x pipe and borla pro xs mufflers, exiting behind the rear tires

    4. #4
      Join Date
      Oct 2004
      Posts
      2,544
      Country Flag: United States
      Run 3" through the mufflers and then reduce to the 2.5" tailpipes you already have. Will make the same power with less increase in noise (assuming you also run an X pipe and 3" Pro XS mufflers).
      Red Forman: "The Mustang's front end is problematic; get yourself a Firebird."





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