Materials to Maintain Your ZHP IIIII Hand Protection IIIII Tools to Maintain Your ZHP
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  1. #1
    Join Date
    Feb 2011
    Location
    La Crosse, WI
    Posts
    193

    Exhaust thoughts (headers and magnaflow)

    I bought my car last February and the PO had already modded the headers and exhaust. He had installed Ebay headers and a Magnaflow catback exhaust. I love the sound this produces but it is a little too loud. I have been pulled over 4 times within 5 months of owning the car for my "amplified exhaust".

    I have been searching for options to keep the same rasp and sound but just quiet it down by about 25-30%. I spoke with one of my friends about it and we thought that adding 2 resonators (one on each pipe) and we thought that might do the trick. Has anyone done something similar to this or have any suggestions on what I can do to keep the sound but just make it quieter?

    -- Sent from my Palm Pre using Forums
    Kyle - Wisconsin Crew - 2001 BMW M3
    Supersprint Headers/Section 2 - Eisenmann Muffler - aFe Stage 2 Intake -
    Bilstien PSS9 Coilovers - VMR V710 (Gunmetal Powdercoat) - UUC EVO Short Shifter - ZHP Shift Knob

  2. #2
    Join Date
    Feb 2011
    Location
    Minneapolis, MN
    Posts
    82
    An additional magnaflow muffler in-line with the existing system should help quiet things down while keeping the sound pretty similar, I would think. You should be able to find a single dual-in, dual-out muffler that will fit under the car, essentially right below the driver.

  3. #3
    Join Date
    Feb 2011
    Location
    Minneapolis, MN
    Posts
    82
    try this: http://www.magnaflow.com/02product/s...e=main&id=9038

    this is a 14" long model, the 11" version might fit better, you'd have to measure:

    http://www.magnaflow.com/02product/s...e=main&id=9036

  4. #4
    Join Date
    Jan 1970
    Location
    Sacramento, CA
    Posts
    546
    Resonators will not help 25-30%.
    -JJ
    2005 Zhp Sedan (Sold), back in the 2004 Allroad 2.7t

  5. #5
    Join Date
    May 2012
    Location
    Northern Michigan
    Posts
    502
    Check this out, I'll keep it updated with my results: http://www.zhpmafia.com/forums/showt...16533-cat-back
    2003 BMW 330i ZHP
    ESS Twin Screw Stage 2 - Wavetrac - Headers - Borla - BMW Performance
    Turner Motorsports - Powerflex - Hawk Performance

    Build thread: http://www.zhpmafia.com/forums/showt...yan-s-2003-ZHP
    Wheelwell: 2003 BMW 3 Series
    Fuelly: 2003 BMW 330i

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