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Akrapovic slip-on valve open vs. closed / N54 vs. N55 mid
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11-28-2013, 06:24 AM
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3rdgear
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Drives: black 1m gt 535i
Join Date: Jul 2013
Location: shanghai
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So guys without the wireless, is the ak in red or white mode, have read many posting but still don't really get it, I see smoke out of all 4 pipes but there is hardly any sound when the car is stationary. So confused
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