I've seen some of the bars for the rear mount that run between the subframe connectors. Some of them with bolt on ends for easy removal. I think my exhaust is in the way, but i'm not 100% sure yet. I still am favoring the modified Hotchkis style mount.
I'm running Summit headers, the Summit 2 1/2" dual exhaust with a home-made crossover tube and Hooker Aero Chambers. I also added oval megaphone type exhaust tips. The tips make a big difference in the sound. I really like the megaphone tips ability so sweeten the sound of any exhaust, especially on the exhaust cut-outs on my e-body.