E30 Exhaust Disappointment

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  • ForcedFirebird
    R3V OG
    • Feb 2007
    • 8300

    #16
    If you "WANT" rasp (as I took the OP), the the easiest way is to put a y-pipe right after the o2 bung and rune straight 2.5" to a straight through DTM muffler. Or, you could just use a Spec e30 exhaust, when we are at the track, the spec class sounds like a bunch of angry bumble bees fighting for turn 1. Spec exhaust is basically a 2.25" straight through to the single ~15" resonator where the muffler used to reside.

    Dual exhaust helps curb rasp.
    john@m20guru.com
    Links:
    Transaction feedback: Here, here and here. Thanks :D

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    • e30strokr
      Wrencher
      • Oct 2011
      • 211

      #17
      Originally posted by MrBurgundy
      mine sounds totally different than that. Mine is no where near that deep.

      Also, that vid is an m50 with vibrant rez and a whatever muff.

      I have a bottleneck rez with a vibrant muff hehehe

      Also, their (vibrant) style of resonators are essentially small mufflers that are much wider in relation to how long they are.

      In my experience a long rez with a slightly larger diameter than the pipe will yield a lighter tone with no drone.
      mines a 2.7i vibrant resonator ( ultraquiet is the one on that youtube) with vibrant muffler single to dual out 3 inch...…

      and a 2.25 non-mandrel bent exhaust...

      doesn't sound as deep but theres no rasp, need to get a video of mine too....

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      • DrJosh
        R3VLimited
        • May 2009
        • 2011

        #18
        My scorpion cat back (stock cat/headers) is not very raspy. Here is a shitty gopro video

        Originally posted by Sonny
        I am a meme for our community.

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        • MrBurgundy
          R3V Elite
          • Mar 2012
          • 5318

          #19
          That sounds really good, what piping are you running to that?
          Current Collection: 1990 325is // 1987 325i Vert // 2003 525i 5spd // 1985 380SL // 1992 Ranger 5spd // 2005 Avalanche // 2024 Honda Grom SP // 2024 Yamaha XSR700 // 2024 Jeep Gladiator Rubicon

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          • AK2002
            Noobie
            • Oct 2020
            • 1

            #20
            Originally posted by MrBurgundy
            mine sounds totally different than that. Mine is no where near that deep.

            Also, that vid is an m50 with vibrant rez and a whatever muff.

            I have a bottleneck rez with a vibrant muff hehehe

            Also, their (vibrant) style of resonators are essentially small mufflers that are much wider in relation to how long they are.

            In my experience a long rez with a slightly larger diameter than the pipe will yield a lighter tone with no drone.
            I’d like to hear a video of yours when you get time. I’m considering the same set up.

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            • e30strokr
              Wrencher
              • Oct 2011
              • 211

              #21
              here s mine

              https://youtu.be/1kjoGgtSadQ

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