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Thread: 2 1/2 inch exhaust enough?

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  1. #1
    Join Date
    May 2006
    Location
    Waco TX
    Posts
    3,113
    The guy finishing the install said the piping isnt big enough. Is this true? he said the motor needs 3 inch
    DANIEL CAMMED SS 13.46 @ 98.17-- 8.58 @ 80.31

    2003 Silverado SS / LQ9 6.0L / Wheatley 93 Octane Tune / 224/228 .581 .588 110lsa / Patriot Gold Dual Springs / Comp Hardened Push Rods / Circle D 3800 stall / Pacesetter LT's / 4:10 Gears / Transgo HD-2 Shift Kit / K & N Cold Air Intake / Corvette Servo / Aeroforce Interceptor / Autometer Narrorband(Wideband on the way) / Mobile 1 Synthetic / Single Chamber Flows with X Pipe / Cats Delete with Cutouts


  2. #2
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    Single or duals? Single, 3" is big enough. Duals? I've seen NBS with dual 2" pipes. I'd do dual 2.5" pipes all the way out with an xpipe.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  3. #3
    Join Date
    Jan 2005
    Location
    Conway, AR
    Posts
    1,353
    I have dual 2 1/4 pipes into a dual in dual out super 40. Sounds badass, of course thats with no cats. dual 2 1/2 is plenty big.

    Chris
    2009 Silverado, HPTuners, all stock.

  4. #4
    DBYRD Guest
    no single 2 and a half inch in and out. right now i just dont have the $ to have him change the exhaust, would it hurt to run a single in dual out 40 series with no cats and 2.5 inch piping for now? in a month ill have a whole 3 or 4 inch job done. need to know if and how this could mess up anything before i can get it fixed.

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