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  1. #51
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    Actually not the case. The additional pipe (in cp-e's case they call it the stealth pipe) serves to eliminate drone. Its a common exhaust design approach used on many higher end setups actually and takes some calculating to be done right. Without it though you're absolutely right

  2. #52
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    Just looked at the design on it, originally I was thinking it was a straight pipe setup with the stealth pipe but it's actually a muffler with the stealth pipe so I could see how they could tune out the drone from an RPM range. To bad about the price though, that's almost as much as I paid for the Berk Street axle back and resonated mids shipped.
    2008 135i - Cobb AP, JB4 G5 w/2Step&FSB, MS DP's, Berk street exhaust, AMS IC, VTT Inlets, UR Intake, ER CP w/Tial BOV, Spec 3+ & Steel FW, CDV delete, Quaife LSD, DSS Axles, M3 control arms, M3 rear SF bushings, M3 Trans bushings, SS brake lines. Pics

  3. #53
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    Yeah price is one thing, eliminating drone and having a great design is another Click here to enlarge

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