Well you can take your names, or initials, and put the word performance after it. If you were Steve and Sean, you could call it S&S Performance. Or use your last name initials, whatever sounds good.
Also could use your town name, "Jackson Speedwerks" or speedworks, etc
Or if you want to specialize in mustangs, "Jackson Mustangs" Or High Powers Ponies, etc etc.
i would definitely take your time with the name choosing process.
Anything with your names in it is a good bet, just remember not to have a title that is completely ambiguous. I've seen too many shops with stupid names like WTF, PSI and so on... PM me if you need any further ideas or even if you might need a tech. I used to live in Oxford and have a few friends in Jackson still. Good luck!