Well, if you go p28 you need a hondata.....swapping any ecu just its sellf will not help you, You hear of people running the p28 because it is cheap and has VTEC. If your going N/A I wouldn't swap the ecu maybe just have it reprogrammed. Me I'm running a OBD1 gsr ecu for the following reason. OBD1 gsr had a less aggressive fuel map making the car easier to tune under boost. It gain 20whp through the low rpm band with the GSR. With the OBD2 my car would have made anywhere from 5-10whp above 8g rpm....but I thought about it my car is going to be a street driven car with once in a while drag strip use. I thought it would be more beneficial to have that low end power where our cars need it the must then the extra up top. It's just what I wanted. So for N/A use I would chip your stock ECU and say money on the harness and ECU...