So as to it being one heck of a drive for me and the fact that I'm just starting to go through round two major engine mods, what happens if I register my car but due to drivaiility issues, come in Jonny's car, is that going to mess up my registration? I'm only thinking worst case but don't want to find out that because I registered my car, I can't substitute his. Anyone have any idea what I should do?