Originally posted by RCWells
Every car with an AFM sees excellent results on the dyno when an MAF/HFM/MAP is retrofitted. Yes, some of this is due to proper tuning, but it's a very simple fact: the newer sensor is much more efficient, especially during quick throttle transitions.
Word to the wise, MarkD is working on a chip that will allow an MAF to be run on an M20. Bobby, with that chip and your AFPR, you'll probably be able to dial in a good setup. I'd say go now with just the parts you have and get a baseline, and see if you're interested in the MAF setup when the chip releases.
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