You could forget the mufflers and just run pipes out the back off the converters. The converters are real good at muffling the exhaust all by themselves. I have done this on a number of vehicles and they sound pretty good. In fact, I just did this with my Astro Van last week. Cost me 40 bucks to have a pipe put in in place of the rotted muffler and it sounds real nice. It's still a V6 but at least now I can hear it running...
Mark