having flowmasters in the back will make it drone really bad if you dont have the resonator. having a mid-mounted muffler reduces drone if you run it to the back. It may not drone too bad being a v6, but I know the v8's are pretty loud inside when the mufflers are in back (flowmasters). It would probably sound pretty good from the outside though.
You might look for the Dynomax super turbo kit on Summit's site also. it would be more quiet outside, but also quieter inside. They're almost stock sounding at idle, but have a nice roar at WOT.
Custom exhaust is another way to do.. I had my entire setup done for not much more than that flowmaster kit, and it includes high flow cats, 3" main pipe, 3" flowmaster muffler, new downtubes (which you dont get in the kit), etc.
Dont rush into your exhaust. Research and be patient (its hard) or you'll regret it and end up spending more money than its worth (speaking from experience)