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10-11-2009, 05:06 AM | #4 |
Rear wheel drive fanatic
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Drives: M3 E30-1M-M4
Join Date: Nov 2006
Location: Greece & Germany
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09-14-2010, 04:08 PM | #7 |
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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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