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      12-21-2012, 05:53 PM   #92
BMW_Belgier
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Drives: E92 335xi n55
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Quote:
Originally Posted by Slops View Post
Secondary cats on the XI has no affect on your O2 sensors since your sensors are way upstream... those additional two does nothing for the car other than added restriction in the exhausts. So your answer will be the same for xi and rwd cars.
Does it have effect on the loudness of the car with catless dps?
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