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    Cat back Exhaust dimensions?

    I'm planning on making a straight pipe cat back exhaust in my metals class next semester and I was wondering if anyone had the dimensions that I could follow to make the proper bends and what not. I'm doing this just for a project for the semester and my existing exhaust has holes on holes so hopefully with the cat intact still I can pass emissions as well. Also what diameter should the pipe be:nice:
    1991 325i Calypso Coupe

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    #2
    Originally posted by Zreberlcoe View Post
    I'm planning on making a straight pipe cat back exhaust in my metals class next semester and I was wondering if anyone had the dimensions that I could follow to make the proper bends and what not. I'm doing this just for a project for the semester and my existing exhaust has holes on holes so hopefully with the cat intact still I can pass emissions as well. Also what diameter should the pipe be:nice:
    Can you not measure your current setup? At the age of these cars there is no guarantee that what is under there is factory stock, or that if you ask one of us that, despite what we think, our "stock" exhaust is still stock either.

    That said, perhaps someone can give you the stock factory dimensions, but that won't be me :)
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