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I have the same coupled with a berk race axle back. Once the car is warmed up, its civil at idle but my god does the beast awaken upon acceleration. I don't daily mine but just recently had to re-install the stock dp for emissions. It really is a piece of cake on the n55. Had it in and out within 30 mins.
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2011 135i DCT, 33k miles FBO on custom e30 tune
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