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  • #1

    CAT size

    what are the stock sizes on the pipes going in and out on a 3.8? What cat should i get? any recomendations?

    96 V6 A4 Camaro and 99 Z28 A4 Camaro     Visit My F-Body Page
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  • #2
    Stock pipe (S pipe) coming from the manifolds to the cat is 3" and enters the cat.

    The cat constricts from 3" to 2.25", exiting out a 2.25" pipe to the muffler and out the tailpipe.

    A Cat converter between 2.5" and 3" is optimal.
    2002 5-spd NBM Camaro
    Details: www.1lev6.com

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