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  1. #1
    Naw T M3
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    Member No: Naw T M3's Avatar

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    Pro/Con of FULL racing exhaust system for E46 M3?

    I was wondering about the Pros/Cons of a full racing exhaust system for the E46 M3?
    I'm talking about real headers, no cats, straight through piping and some sort of aftermarket/racing muffler.

    I am not worried about any emission laws.

    -Have any of you done this?

    -What kind of HP gains?

    -What kind of impact would it have on the computer and what would I have to do to correct it?

    Any and all info on this subject would be appreciated.

  2. #2
    Registered Member
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    Member No: 66839 mpowerme is an unknown quantity at this point mpowerme's Avatar
    Join Date
    Feb 2003
    Rep Power

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    It's all good.

    Some have shown 20-30 HP gain at the crank. Stock ECU will adjust some, but to get max gain software tuning would help a lot!<br>///MPowerMe

  3. #3
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    Member No: 635Bill's Avatar

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    Re: Pro/Con of FULL racing exhaust E46 M3?

    We race an M3 E46
    1. You need rear cat simulators. Some keep a constant number. There is a set that will vary 2 degrees back and forth to give the computer the info it wants to read....So it does not go into limp mode. E 46 is very different.
    The small Borla muffler is great. So you give up 4 HP... Straight exhaust is just annoying.
    Good Luck

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