Quote:
Originally Posted by Camaro1973
A very reputable shop wouldn’t be tuning without a wideband. You simply cannot go by the commanded AFR. The wideband needs to go before the cats (if there is any) on headers it’s the front most o2. Some will use the front o2 ports and some will install a bung in the header.
Some just toss a sniffer in the tailpipe, also a bad idea.
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In my experience, most tuners use the the tailpipe sniffer because it’s easier. You know, “Time is money”.