James from BMC had a freaking glasspack with 1 3" side exit pipe. It was actually not too loud. It made the car sound like it had a larger displacement engine in it. Cool thing was with the side mount I could hear the turbo spool from the passenger seat.... right out of the exhaust. Turbo kills mosta the noise.

Summit sells "Purple Hornies". Check em out. I'd rather see one of those than a fart can.