If I had a v6 I would go on the VWVortex classifieds and find a deal on a muffler off a vr6, then weld that on to some ebay piping or get some fabbed up at a local shop.
See how much different the catback is set up here? It's the best way to do a low displacement v6 imo.
http://www.youtube.com/watch?v=OhNIeZ7FzwU