i just hooked up an apexi s-afc and you can check the o2 voltage on that thing and adjust fuel according to.no tacky guages just number to the thousandths. pretty acurate. i have been going through every 500 rpm and getting the o2 voltage between .900 and .920. when it was factory i was hitting as high as .985 in the higher rpms. i have a n/a though so the turbos might be a little different but i am sure it would still work.
mike
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