I've got a 99 civic dx, it has a engine swap from a 98 integra Ls. It runs like complete shit and i want to put a new engine harness in it as mine is hacked. Which harness's can i use?? I know people recommend the ex/si (which i dont know why, the si has a bigger dizzy plug) but can you use other harness's? Car is 99 civic dx, so it's obd2b. The engine is from a 98 integra ls, so it's obd2a. Which engine harness can i use??? Also, the car has a obd1 jumper harness and is running on a p75 ecu. Please help!