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M3 Eater,
It is really simple. The AFR is determined from the front sensors, not from the rear. The location of the front sensors is the same regardless of which downpipes you are using: immediately after the turbos. The AFRs will NOT be affected regardless of your hardware choice, for as long as the actual sensors are not damaged.
The rear sensors are for making sure that the catalytic converters are actually doing their job.
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