If you get a slip-on dont do anything else. If you get a full exhaust, then go ahead and add a jet kit and advance the timing +4 deg. With a slip-on the other mods wont yeild as much HP.
But I'm with Cecil. If you start tinkering with your bike, before you know it you'll have a crazy HP bike that never runs. Although currently mine is running. I think Cecil and I are alternating our run times. LOL
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Do you really have to start a thread every time you go on a ride and see a guy with no helmet on?
Does it affect you that much that some random guy 1500 miles away went and paid his own money for a 1000?
Do we really have to fight over who uses the back brake or not?
Do you have to argue over stupid pointless shit on the Internet?