New 2009 2010 BMW Z4 - ZPOST - View Single Post

firewalker · 09-14-2010, 04:08 PM

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.

09-14-2010, 04:08 PM	#7
firewalker Registered 0 Rep 4 Posts Drives: E89 Z4 35i Join Date: Mar 2010 Location: Cheshire UK iTrader: (0)	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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