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2009 Z06 / 2013 F150 EcoBeast / 2008 Twin-Turbo Bimmer
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Your check engine light should come on within two driving cycles for having gutted converters.

Instead of purchasing rear O2 simulators:

A. MTI may tweak your PCM for free or reasonable price.
B. Purchase tuning software and do it yourself.
C. Send in your PCM for a Stealth calibration.
D. Live with the light and see what B&B does for a final solution.

Right now, I've got just the O2 sensor on the left side shut off in the PCM; the right side is still functional.
 
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