i know a guy who raced a r6(sponsors and everything)
his father owns a bike shop and i ran into both of them there and he told me:
"i can tell you to upgrade from ur slip on to a full exhaust of get a midpipe and a pcIII and stuff to get more power... but to be honest with you, you cant just jump into upgrades on bikes... its like a chain... it all links to one another. You need supporting mods too... such as vel. stacks, intake, possibly even engine work... this will give you the full power of your upgrade and keep your bike safe."
thats to what i can remember him saying.... it was about an hour long debate...