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Hartge quad exhaust for 35i
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09-14-2010, 04:08 PM
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firewalker
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Drives: E89 Z4 35i
Join Date: Mar 2010
Location: Cheshire UK
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The std system has primary and secondary cats, primary cats are ECU monitored by sensors, you can change your std system for an aftermarket one with no ECU reprogramming if you remove the secondary cats.
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