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      04-27-2013, 06:11 PM   #33
lsmkr01
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Drives: E92 M3
Join Date: Feb 2007
Location: SC

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Quote:
Originally Posted by Mike Benvo
Doesn't matter what changes are made AFTER the post-cat oxygen sensors. The car is "numb" to these changes and will not throw a CEL for anything downstream of the post-cat o2's. So as long as the primaries and both sensors are installed (before and after the primaries), any setup should not trigger a fault.

It doesn't make sense to me that this would trigger a fault if the stock primaries and sensors are left in place.
+1 your fine if you keep your primaries. I've been running with CEL light for emissions for a week now. Its not a big deal to see a little light for the amount of power you get. With that said i look forward to adding a tune when a group buy from BPM comes up :-D