exhaust question

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  • bmwstephen
    R3VLimited
    • May 2009
    • 2463

    #1

    exhaust question

    might be a stupid question but on an oem catback system, there is a flat area of in the middle of the piping right next to the hanger prong before the pipes resume its original diameter. anyone know what purpose it serves?
  • E30Gus
    Mod Crazy
    • Jun 2008
    • 781

    #2
    clearance I think. It is the lowest part of the exhaust.

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