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Downshift Backfire!! after chip mod....
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05-23-2013, 06:55 PM
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sylonien
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Drives: M3
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Glad mine isn't the only one!
I love it and my mates ('09 DCT) doesn't do it at all and his exhaust is straight as a don't know what, modded OEM back box, zero cats or resonators. But doesn't pop at all.
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