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I have used the AFR on a lot of cars. If you plan on messing with it much, I would take the AFC over it. It is tedious to use/tune and easy to accidentally mess up settings on the wrong RPM. One thing that the HKS AFR doesn't have that the SAFC has is are low vs high throttle maps. On most cars, we have the high throttle maps leaned out a lot more than the low throttle maps. That was one problem with the old style 5 knobs AFCs. If you wanted it to pull out 25% air signal at WOT/full boost at some rpms, it will also do it at low throttle when you really didn't want that to happen.
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