As mentioned by Vincent, CVT mods! CVT mods are easy, can be cheap and also, safe. Pipe (full or slip-on) mods will require the tuner to make sure you don't start running lean. What I found from a slip-on exhaust and FI tuner, is not much actual gain in terms of seat of the pants feel but it will increase the exhaust loudness/note. Some like the increase in loudness, some don't. I didn't like it for all day rides which is something I do more frequently.
Also, don't go and buy some packaged clutch kit. Consider looking into what Vincent listed out by buying each piece separately.
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