I'm just beginning to learn about ecu's but i do have a couple of questions if anyone can answer them. I have a 88 Prelude si 2.0 with 4ws and i want to convert my OBD-0 to an OBD-1. The main reason that i wanted to do this is for the dignositic application of it. For one is it possible and do i have to change my ecu/engine? Next is it even worth it if i don't plan on doing a engine transplant and only minor modifications? Is there anyway that i can work on dignostics without converting to OBD-1? If i did upgrade my ecu and upgrade to OBD-1 what major modifications would then become viable on my stock engine? I relize that some of these questions may be simple but I'm young and still learning. Any help will be greatly appreaciated, I have done as much research as i can find about it in order to not waste your time and hopefully get some answers.