IMO, go for the GT takeoffs with an H pipe. GT takeoffs have a great tone without any drone. You can expect to pay around $300, including all parts, installation and labor, very reasonable and your best bang fpor the buck.
One of my neighbors went with the Flowmasters and his car sounds like a pickup truck with a leaky muffler.
"Political Correctness means always having to say you're sorry"
05 4.0 Screaming Yellow Premium Coupe: IUP, Auto
SCT X-Cal2, MAC CAI, Dual GT Takeoff Mufflers w/ H-Pipe
4:10 Richmond Gears, Pony Package Grill
Best 1320 Time 14.7 @ 98 MPH (Before the 4:10's)