Does the Full Exhaust really make a difference compared to a Slip-On?

Thanks

 

It would probably depend on who the maker was, and how the muffler is designed, but I do know that there isn't much difference between the RWR exhaust I used to have and my Yoshimura slip-on I currently have, except for the noise, and the swingarm hitting of the RW megaphone, but power wise they performed very close, if not equal, on my STOCK motor. Internal modded motors may show different results though.