Late post but you need the upstream O2 sensors for sure. Downstream sensors only monitor cat health and have been known to potentially cause idling issues in BP kits. You can easily remove these (Sasha includes plugs) but consult your tuner first as he has to disable the CEL and some tuners like the downstream O2 sensors for doing their stuff. Go OEM for sure.
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'15 370z Nismo Tech 6MT Magnetic Black, V2 BP Kit 6467 Unexploded Turbo | '06 350z Touring 6MT Carbon Silver
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