I would have to say that the HKS hi power IMO is the best sounding exhaust out there for the z32. Its a little more mean sounding than specialty z/labree and such but louder as well. Not a HUGE fan of the split leg look but the price is right...$600 shipped to my door. I can buy 3 HKS setups for the price of one B&B or specialty Z, so I think its worth it for sure.
Technology is the only substitute for cubic inches