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if you plan on running more than 20psi of boost you'd want a 3 bar map sensor. as for aftermarket ECUs i am currently about to install a haltech platinum sport 1000 into my FD. it comes with a built in 2.5 bar map sensor which saved me some money.
im not sure what is considered to be the "best" at aftermarket ECUs, but like above poster said...go with what your tuner is comfortable with. he'll be able to get the most numbers out of your build and you'll be happier!
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93 RX-7 FD R1
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