Turbo models with 4 O2 sensors?
What does the ECU use the two O2 sensors in the downpipe for? Specifically a 1998 VR4 non-Cali spec.
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1998 VR4: SS Downpipe, Borla Cat-Back, Open Element Air Filter, ACPT CFDS, DN Intake Pipes, Front & Rear Strut Tower Bars, Deftracing 575 Hood, Blitz DSBC, Vacum Redution, Krank Vents, Titan Headers w/ Big TD05 16G Turbos,
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