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Thread: Recommended exhaust size

  1. #1
    Join Date
    May 2018
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    '99 E39 528iT

    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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    97 532M*06 X5*19 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 08:34 PM.
    1997 BMW 532 M (formerly known as 528iA) * Alpine White on Black
    E36 M3 S52 engine / 5 speed manual * Kassel Performance Tune * Bilstein B12 * 18" M Parallel Wheels * Supersprint Headers * HJS cats* Remus Muffler * Full custom SS T304 exhaust system * 3.15 Diff * Euro Leather Armrest * Spal Electric Fan * M Sport Steering Wheel * OEM Aero Front Spoiler * 324mm Brakes Upgrade

    2006 BMW X5 3.0i Sport Package Alpine White on Black * Spal Electric Fan (fan clutch delete)

    2019 BMW X3 M40i * Alpine White on Mocha



  3. #3
    Join Date
    May 2018
    Location
    Florida
    Posts
    247
    My Cars
    '99 E39 528iT
    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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