Both the p28 and gsr ecu will run the motor a little lean on top and therefore probably make more power. The gsr vtec x is way too low for the h22a engine. The p28 will need to be chipped and it will not operate the secondary butterflies on the prelude manifold.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.