Depends how much you want to spend and why you want more.
The lowest cost and easiest would be a set of cams to work with the 103. Se 255 are a direct bolt in no head work needed so not extra cost. They will give the bike a nice kick and you will end up with no issue tuning it.
You would have a couple option for tuning. Adding a good fuel manager any og them will have a prefect canned map for the mods, or SERT. While it does not get any better than a SERT the cost is high and would need to be tuned again if you did any mods down the road.
TFI would meet all your needs at a good price you can install it your self if you want.
PcV little harder to work with but some like the few more option it offers but comes at a price and they have been known to fail.
Know were you want to go before you start this. You have one of the best Mods you can do to a TC right now the 103 kit. Going to far with a street rider that you plan to ride can be disappointing.