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Message: <blockquote data-quote="95Grandtouring5.0" data-source="post: 811587" data-attributes="member: 8663">It's had one done before, while I don't remember the numbers exactly, but the compression on all cylinders was pretty good.It's an oem maf that was replaced a few years ago, and the tuner programmed the chip for the 30lb injectors. When he did the dyno run, he had put a wide band on the car, and he made it so that the AFR was 13.0 at WOT, as you guys can see at the bottom of the dyno sheet. Yeah the 02's I was thinking should be replaced, and I'm not very good with electronics, so how would I go about checking the voltage, and where would I do it at?</blockquote>