Pypes mufflers on a TTI exhaust
If you want loud, throw on a pair of these babies.
http://www.classicchambered.com
I think these are some of the loudest mufflers out there, by design (and very good flowing too). I'm going to put a pair of the 26" x 2.5" on my 318 Duster with a Pypes X-pipe system from the stock manifolds. The Charger on the website sounds pretty wicked, but I think with a crossover (and minus the cheap microphone distortion) it will sound pretty bad a$$. They're much like glasspacks in that they can also be used as resonators, but these ones are better designed and have no packing to blow out.