I've got a full GYT-R carbon system. Love it.
the slip-on should be the same as mine, and the quality in '03 really got way better. Sounds awesome, deep rumble down low and she screams up top. Pretty loud..........I would of had an exact db reading of how loud it is, but forgot to run the decible meter when i was on the dyno.
I should of had dyno results today, but ran into bad coils, so when i get them replaced, i'll be going back to the dyno.
I would recommend getting a PC3usb with any aftermarket system, and if your looking for a good aftermarket slip-on that is cheap, look into Jardine RT-one. Hammy could hook you up with that, maybe even a PC.