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Just doesn't have the features and easy tuneability of most the other systems. Does it even run a two or three bar MAP?
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I don't know about 2 or 3 bar MAPs, but the MEFI 4b and 5 are big advances over previous MEFI systems, and even those have more capability than aftermarket systems. It's just that tuning software is lacking for them in a non-proprietary offering. If you have a MEFI, it's connected and you have a running car, and you've got the cable and USB dongle, I'd keep it. They can be connected to wideband or narrow-band O2 sensors, either one or two. They can be run closed loop at WOT. It's just that the tuner/end user has to do the integration to get it all working. If you are buying something new, I'd get something more user friendly.