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Thread: Cat Back Exhaust Noise Dilemma

  1. #1
    Senior Member mdepena's Avatar
    Join Date
    Feb 2009

    Cat Back Exhaust Noise Dilemma

    I have 2008 E92 335i with a cat back exhaust and resonators that I purchased and had installed by a local manufacturer (who I will not name - at this point).

    It seemed to be of high quality and things were hunky-dory. I've had the exhaust for about 6 months and about 6,000 miles (I don't drive the car that much).

    Recently, the exhaust has gotten really loud and the drone is just driving me crazy. At RPM's between 1800 and 2600, the drone is so annoying. So where am I going with this?

    It appears that the glass in the mufflers finally got packed or it disappeared altogether. My wife refuses to ride in the vehicle due to the droning. Can be good and bad.

    My question, does anyone know how to fix this, beside yanking out the current exhaust and replacing it with something quieter? I've read of people placing harmonic dampeners, but don't really know anyone that has done it. They look strange from underneath (not that anyone will see it, but it looks rather goofy).

    I'm open to ideas and suggestions before I have to bite the bullet and replace the mufflers or the entire setup.

    Edit: The manufacturer has a lifetime warranty, but I have to yank it out and ship to them (no car for who knows how long) and they'll inspect and replace, if defective.

    Thanks in advance.
    Last edited by mdepena; 10-07-2010 at 10:33 PM. Reason: Added additional information.
    2008 BMW E92 335i Atlantic Blue - Dinan 2nd Stage, Sprint Booster, BMW Performance Exhaust
    1996 BMW E36 M3 Cosmos Black - Ground Control Struts, Eibach Springs, Koni shocks, Treehouse Racing Control Arm brackets, Turner Racing Sway Bars, Sparco Strut Bar, Turner Rear Control arms, Toyo RA1s 255/40/17, - Engine Stock

  2. #2
    Senior Member pseto's Avatar
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    Nov 2004
    Columbia, MD
    Did u check over at e90post?

  3. #3
    Senior Member mcoupemindy's Avatar
    Join Date
    Jul 2007
    Unfortunately all exhausts deteriorate this way if glass packed. You can add more goods in the path (resonators, etc.), but that destroys the original purpose IMO. I highly doubt it would be worth it to get a new one from the manufacturer as the new one most likely will progress the same way.

    My suggestion would be to find someone with a more quiet exhaust to your suiting and work out a trade deal.

  4. #4
    Senior Member
    Join Date
    Jul 2004
    Bethesda, MD
    Given that you've named them in your sig, I don't know why you feel reluctant to state it in the post. At any rate, take it back to them and have them check it out.
    2006 GMC Sierra 2500HD 4WD Duramax LBZ/Allison 6-speed
    2002 BMW M3 - Alpinweiss III/Black
    1999 323i KP/GTS2 - Alpinweiss III (Black Hood, other stuff)
    1990 325is - Brilliantrot/Tan
    1989 325is - Alpinweiss II/Black (S50B32)
    1989 M3 - Alpinweiss II/Black (S62B50 in progress)

  5. #5
    Senior Member JC5's Avatar
    Join Date
    Feb 2006
    Arbutus, MD
    Try http://www.mandrelbendingsolutions.c...template=about they are regarded as on of the best, and are in the area. The page doesn't mention installation, but they do do it on site. I'm sure they can fix your exhaust issue.
    Supercharged '03 530
    Thinking about tracking down an e28 535is

  6. #6
    Junior Member
    Join Date
    Jan 2008
    MBS does really nice work,this is their local website.

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