A lot of us removed the center manifold and replaced it with a Magnaflow piece. Less than $200 installed at the local muffler shop. I left the two resonators before the tips on to keep things a little quieter. Has a nice rumble, a wee bit of cackle on non-throttle down hills, and very little noise drone on the highway. No where near as pure ungodly bliss as the sound of my prior Porsche GTS, but it was only $200 bucks.
I like it - gives a little edge to my S\C from the bazillion pampered soccer moms driving the exact same black RRS in my neighborhood.