Smitty's correct - my Rinehart's are a "deeper" sound, but not much louder than stock until you give it some throttle. Works good on the 09 SG b/c I want to hear the radio while cruising.
Definintely listen to some pipes (internet & in-person) to get a feel for your style. Want to dial-in a bit before investing $800 - $1000 on an exhaust set-up.