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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > GIAC Stage 2 Hardware Requirements Question



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      12-12-2010, 05:18 PM   #67
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Drives: 2010 E92 335i
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Quote:
Originally Posted by Austin@GIAC View Post
He has the AR catted DPs. His car has some of the highest numbers on our dyno. From what I can tell, they really aren't a hinderance.
Thanks, that's very encouraging. Do you know if he retained the stock exhaust and secondary cats? If so, are those also significantly restrictive or should one just concentrate on the DPs if prepping a car for GIAC S2?
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