i have a 98 ex. if i were to buy a p28 ecu, what harness would i need? also, whats the ecu do? engage vtec?

 

your stock ecu should engage vtec. but if you wanted to throw in a p28, you need a obd2 - obd1 jumper harness. the p28 wont do much if anything if you use it by itself. but depending on your engine setup, you can chip the p28 with hondata or some other engine management to tune your car to the right specs..