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Thread: Recommended exhaust size

  1. #1
    Join Date
    May 2018
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    Florida
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    '99 E39 M5T

    Recommended exhaust size

    I'll be doing an S62 swap, before long, in the ole wagon. I'm still utilizing my spare tire compartment, so I'll only be running a single muffler. What would be ideal for pipe and muffler size?

  2. #2
    Join Date
    Sep 2010
    Location
    Ooltewah, TN
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    2010 BMW M6*2019 X3 M40i
    I've done extensive research on that subject when I did several custom complete exhaust setups on various E39's and 3" is plenty for stock S62.
    2.5" if going dual.
    This is information from several reputable technical articles where there is basicaly sort of a table stating optimal exhaust tubing ID in relation to engine size / output.
    If going forced induction, than things are little different and you have to bigger at certain higher HP output.
    Last edited by BMW540san; 11-01-2022 at 07:34 PM.
    2010 BMW M6 SMG Coupe * Black Saphire Metallic * Full Leather Merino Black
    2019 BMW X3 M40i * Alpine White * Mocha Leather
    Former:
    1997 BMW 532M (528i with 3.2 S52 engine from E36 M3 / 5 speed manual)
    1998 BMW 540i 6 Speed
    2003 BMW M5





  3. #3
    Join Date
    May 2018
    Location
    Florida
    Posts
    262
    My Cars
    '99 E39 M5T
    Good to know. I was thinking maybe just going to 3" midway, for a single muffler. Or dual 2.5" if i could find the right dual in/out muffler.
    Quote Originally Posted by BMW540san View Post
    I've done extensive research on that subject when I did several custom complete exhaust setups on various E39's and 3" is plenty for stock S62.
    2.5" if going dual.
    This is information from several reputable technical articles where there is basicaly sort of a table stating optimal exhaust tubing ID in relation to engine size / output.
    If going forced induction, than things are little different and you have to bigger at certain higher HP output.

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