I decided to have my exhaust modified (08 model 124000km) by an expert (Redline Exhausts here in SA). I like the sound, deeper note without being obnoxious. It was much less expensive than Staintune or Delkavic or any of the others at $300 all up. I like to kid myself it is more fuel efficient with an improvement in power and throttle response - but if there is improvement it's negligible. Would I do it again? Yes, I reckon I would purely because I didn't really like the sewing machine/Jetsons sound - call it a character flaw.
Cheers Mark.