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  1. #1
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    AR catless DP and Maddad Whisper axel back + mid pipe installed! Weird rasp?

    Hey guys,

    I installed the AP catless dp and madada exhaust last weekend. It wasnt hard but around 1500 to 2200rpm theres a very loud rasp noise. Once it passed 2000rpm it sounds totally fine?? I am not sure whats going on because I already checked all the connection and nothing is hitting or in contact from DP all the way back. Here are a few logs I got tonight. Please let me know if you guys see any leak or weird things going on. Thanks in advance Click here to enlarge
    Attached Files Attached Files

  2. #2
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    Argh you guys can work with the txt files, I'm going to bed.
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

  3. #3
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    OK excel files Click here to enlarge
    Attached Files Attached Files

  4. #4
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    Click here to enlarge Originally Posted by Sam0329 Click here to enlarge
    OK excel files Click here to enlarge
    Haha, I'm still going to bed but I like your style and effort. Someone will look them over.
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

  5. #5
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    Do you have resonators or mids or anything in the middle or is it straight pipes?
    E92 AT. COBB S2+ , FBOs.

  6. #6
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    normal to get crappy sound with catless dps and catless midpipes.
    07 335i AT - MOTIV 750 - MHD BMS E85 - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
    Click here to enlarge

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    Pretty normal. Add a resonator maybe?

  8. #8
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    The madam system have a resonator in it already. Just want to make sure its normal. Will try to do a video with my iphone. Thanks guys.

  9. #9
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    I think I had same sound like you at 1800rpm(catless from DP to X pipe with stock muffler)
    now, catless DP then ONE straight pipe to stock muffler the weird rasp sound is gone and no drone at all

  10. #10
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    I have the same setup with the same issue. I guess that it is normal.

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