The R6 still has the stock pipe for now.
The R1 has MJS Motorsports exhaust which are basically stock pipes but they were gutted and repacked using race baffles and different packing and then wrapped in carbon fiber with the outside ceramic coated. The Y-pipe had the cats gutted and also were ceramic coated.
They sound pretty good imho and are louder than stock and the heat they were producing has been greatly reduced.
They produce a little more HP than stock as well.
Similar to this but this isn't me or my bike.
http://www.youtube.com/watch?v=LRV-3...rom=PL&index=5