For a car driven on the street there is no reason for an aftermarket ECU.
Aftermarket ecu = No OBD-II in a 95+ car = no registration.
If the car is Off-road only - Real race ecus like Motec, Cosworth, etc. Serious money will be spent tuning the ecu for reasonable drivability. Reasonable drivability for a racecar is quite different from a street car.
Manufactures have the money to tune their cars to run well on the street. Most of us don't.
It all depends how much time and/or money you have + if you want a project that may never end.
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PCA Intermountain Region Track Chair
SPB #50
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