I had an SS slip-on and went with a stealth can on the full system. At first it sounded about the same, but after actually riding it a few times, I prefer the stealth. At cruising speed, the slip-on got to where it droned after a while, the stealth can I can barely hear while cruising, but still has a nice growl when being whipped! As for power difference, I've been told there's only 1-2 ponies difference. BTW, I just had mine custom mapped and went from 131 with the slip-on to 143 with the full system/stealth can.
