When you say full exhaust, it makes me think cat-back... but yeah, usually when domestic guys say full exhaust, it's from the headers all the way back with no catalytic convertors. If you have an import I'm going to assume it's not 20 years old, so if you live in an emissions county, your screwed.

Catback would probably be what you want. Or if your short on cash, a muffler with some custom muffler shop piping will usually give you the same results.