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Most guys get tuner to tune car using tuners tailpipe wideband.
When they install failsafe wideband it usualky just to save motor if it runs way lean so doesnt need to be super accurate for failsafe function just consistent . Just pointing out you could do that with stock sensor rarther than jnstalling separate sensor and wiring.
I would also assume ecutek would have warned tuners not to use the stock sensor for full time closed loop fueling in racerom 10 if the stock sensor was not accurate or consistent enough ?
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