I'm working on project to put a 2001 navi engine into a 98 Mustang GT. In the process of building the engine at the moment. Here's a few questions I've yet to figure out: 1. Can I use the stock computer to run the navi engine? Knowing I'd have to convert it to COP ignition, how is this done? How hard is it? 3. Should I just use the Navi computer? If so, can I modify the rev limiter? It tops the engine out at 5500 RPM from what I understand. Can anyone explain what I use to modify stock perimeters? And what perimeters are adjustable. I don't have an unlimited budget so I'm not shipping my car to be tuned professionally. Plus, I'm looking forward to learning to do it myself. Bare in mind, this will be a street car. Probably wont see the track. And will never be a daily driver! Hopefully I've asked the right questions, feel free to help with any info you can provide. (I have already picked my project, please keep your opinions about whether or not this is a good idea to yourself) Thanks all!