As always...
I suggest buying the trubendz Magnaflow non-res system if you don't plan on runninga hi-flow y-pipe and headers. The sound at idle is perfect and sounds great at all rpm's. However, traveling on the interstate at around 3k the sound gets annoying after awhile. Thats why I suggest magnaflow and not the flowmaster, cause the flowmaster is quite louder.
If you plan on going with headers and y-pipe in the future, I suggest the trubendz magnaflow resonated system. The resonators should help quite it down, cause believe me, without res, and headers and y, this thing is loud!
