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muffler or catback?

This is a discussion on muffler or catback? within the External Engine forums, part of the LSx Technical Help Section category; Originally Posted by 180ls1 x2 for the 2.75 9t8z28 you seem like you know a lot about exhaust is there ...

  1. #41
    2004 HEAD/CAM CTS-V 9t8z28's Avatar
    Join Date
    Oct 2006
    doylestown, Pa

    2004 CTS-V

    Quote Originally Posted by 180ls1 View Post
    x2 for the 2.75

    9t8z28 you seem like you know a lot about exhaust is there really any gain with a catback vs. muffler back with both systems same muffler on a stock y pipe car? As i have said before it is necked down to smaller then 3" at the end of the y pipe so i do not see how a 3" pipe going to the muffler will help power wise if it is being choked down before that. Am i right?
    You are correct. The stock Y-pipe is pretty restrictive, but you will see no gain with the 3" midpipe vs. 2.75.

  2. #42
    let the F-Bodies roll jimmybling31's Avatar
    Join Date
    Oct 2007
    hixson tennessee

    94 camaro z28

    Quote Originally Posted by 9t8z28 View Post
    No, it's 2.75"
    ah. i was close. i just thought it was 3 because that's the inlet size on the muffler. i looked at it again today and it has a weird weld on it from the shop making it fit up and everything.

  3. #43
    Junior Member
    Join Date
    Jan 2008
    sport exhaust for you

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