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stock y-pipe tubing

This is a discussion on stock y-pipe tubing within the External Engine forums, part of the LSx Technical Help Section category; do you guys know what diameter the tubing is? it goes from the manifolds, then the driver side comes of ...

  1. #1
    Powerstrokin LT1 > LS1's Avatar
    Join Date
    Dec 2007
    Aurora IL

    Trans Am owner

    stock y-pipe tubing

    do you guys know what diameter the tubing is? it goes from the manifolds, then the driver side comes of to passenger side, stays in 2, then merges into 1 at the catalytic converter. I was gonna buy a 2 into 1 stright pipe from jegs. they are like $15, and I know a guy that welds.

    so, do you guys know? my car came from the factory with the "low restriction" exhaust. I dont know the difference. I tried wrapping a piece of string around on of the tubes, then measuring it, and its came out like 2 3/8"

    I dont think thats right is it? btw, the car is a 95, single cat

  2. #2
    Join Date
    May 2008
    Verdigris, OK

    99 z28

    im not sure about '95, but my stock y pipe is fucking tiny on my '99z(never realized or noticed how small it was until i was poking my head under the lift). noticed this today, had my muffler put back on earlier today. looked like 2 inches, or so.

  3. #3
    yuengling and wawa
    Join Date
    Sep 2007
    Philly+Glenmoore, Pa

    Pewter Metallic
    2002 Trans Am WS6 M6 D1SC

    The stock Ypipe is crap. Anything you can do to get more flow is better.

  4. #4
    King 0f n00bz shady milkman's Avatar
    Join Date
    Jan 2006
    Shepherd, Michigan

    blacker than wesleysnipes
    98' trans am

    thats why i cant wait for my LTs so i can bolt them up with the qtp y pipe i have beefy as hell

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