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Are none of you worried that the shaft exhaust doesnt come with a back pressure valve control? Your backpressure is gone mates.
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2013 X6 50i Sapphire Black
2012 550x Alpine White
- 12.727@108 - 1.7 60ft lemon'd
2011 550i Sapphire Black
- 12.960@109 - lemon'd
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