You all should check out a company called Timevalve Mfg. Co. They make direct fit SS exhaust and cat. components for ALL M-Bs. I've been doing a fair amount of research on this lately and they seem like the right choice. I also believe they can work with customers who have certain requests like ditching the center resonator. I will most likely work with this company when mine starts to fail.

http://www.timevalve.com