Resonator on the 6th Gen

Currently, I have a free flowing exhaust. It was a custom job that took two days and has the dual exhaust set up...not just a "fake exhaust" on the end. It's great cuz I love the way it looks, on the downside, it's extremely loud. I recently added a CAI, and can't even hear it cuz the exhaust is so loud. The car has been soundproofed and it's still so loud that you can't carry a conversation. On top of that, a friend of mine recently got ticketed for "Illegal Modifications" because his exhaust was too loud. My exhaust is much louder than his, so it's likely just a matter of time before I have similar problems. I'm now thinking about putting in a resonator and wanted some input. Are there various ones available? Different sizes? Can I choose to put in a smaller one, and keep some of the power/noise? Is there a make I should be looking for?