View Poll Results: Whats do you guys think is wrong with it

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Thread: E46 M3 Sounds like it Lost its Rasp

  1. #1
    Join Date
    May 2017
    South California
    My Cars
    2004 E46 M3

    Question E46 M3 Sounds like it Lost its Rasp

    Hey, its my first post here and I come in a dire need for help. My e46 m3 exhaust noise suddenly changed as I was driving to work about a few weeks ago. The tone of the car's exhaust changes as I drive and it warms up, so it has me stumped what it could be. The car currently has a catless headers with a cat placed a little further back in the exhaust. I was thinking that the cats were clogged, according to my father who used to be a mechanic. They are after market cats and I have the oems, was wondering if swapping it out with the oems would fix it. Any suggestions? Would the exhaust leak the car currently has be an issue?

  2. #2
    Join Date
    Aug 2015
    Cologne, MN
    My Cars
    03 M3 00 740i 98 528i
    It would be a place to guess is you hit the bump and the stuff inside the cat broke and may have jammed itself somewhere in there blocking some flow in turn changing the sound coming out of the pipe......kinda weird and a long shot but possible tho.
    2000 740i - 149K - Dville Monsoon rear deck speaker upgrade, GROM audio Bluetooth
    1998 528i - 204K - GROM audio Bluetooth setup, Drilled/Slotted Rotors, BSW Stage One speaker kit, Facelift Xenon's with Angel Eyes
    2003 M3 - 210K - BMW Euro Cross Drilled Rotors

  3. #3
    Join Date
    May 2017
    My Cars
    e90 m3
    Yeah I'd agree. Sounds like you somehow changed the internals of the exhaust.

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