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Bumping this thread as I'm about to install some and try to pass smog without removing my DP's. Hope it works. I'll post what I find. As of now, with the JB4, it blinds the sensors and in turn will fail smog when the computer see's the sensors aren't ready. If I turn the tune off and let the sensors do their thing, once they warm up it will throw a cel and still fail smog. So, with the O2 sensors pulled out of the stream, I should be able to turn off the tune, let them complete the ready cycle, and pass smog.
Wish me luck.
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2015 435i Gran Coupe - Current
2008 AW 135i - Sold |