Gosh I would not do it (nor did I) without logging with my BT tool carefully. I felt fine however when the logs looked identical in terms of A/F ratio and every other paremeter as running straight 91 other than timing targets were hit more consistently. BT tool logs don't lie so I was convinced of the safety. The car runs a wideband 02 sensor all the time. All you need is a BT tool to log and monitor the wideband that is built into the car. I again would not do it on a supercharger because you are really stressing the fuel pump. Maybe the very lowest supercharger but even then its already a strain. In NA applications the pump has so much reserve and watching fuel trims it is actually barely pumping out more fuel to really be negligible to straining the pump
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