plastic:
I'm working this out as a future summer project,but the only way to go is installing a universal single-to-dual exit muffler with the same measurements as the OE one, and then having them both exit at the driver's side, just as the early range rovers,as you will have clearance issues on the passenger side,besides that if you modify the cat setting,you will have issues with a continuous service engine light(there are 4 O2 sensors,so the thing is pretty sensitive...).
Carlos