what your hearing in the video is compressor surge and thats not a good thing it can destroy a turbo.
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2009 135 in transit
jet black, coral red, 6mt. sports, hifi, ipod usb, idrive
parts sitting in garage: RR intake, plenum, ddv, cdv, catless dp's, o2 sim, catback, bmw performance shifter, m door sills, cf spoiler, cf mirror caps, cf grills, cf pedals.
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