stock 2000 serg 10.000mi on it, want to wake her up a bit,what would you do? would like to see 100hp and get hwy rpms down.
Depends upon how thick your billfold is. Basically, there is no substitute for cubic inches....bigger is better...and the bigger the money to get there. If you want to start out easy then (and assuming you have a truly 100% stock bike now), a free flow exhaust will get things rolling...then add a performance air cleaner system. Both of these items you can install yourself...if so inclined. Then you will
want need to take care of the tuning side of things. Either a Race Tuner or Power Commander (or the like) and download a map (from this site) that is similar to your configuration....there are a number of maps available that you can download to get you started. Then consider a real performance/dyno tune session to bring it all together. That should get you close to the 100 mark. After that, then you will need to look at cams/heads/etc. and additional tuning as necessary. The confusion now will start with WHICH performance exhaust and air cleaner system to go with. What do you prefer for looks and how loud are you willing to tolerate? A 2 into one will provide performance whereas a true dual has good looks & sound. Don't forget the backseat rider when considering decibels. Suggest searching through the plethora of threads available on this site about which performance mods have been done for rides similar to yours. Getting rpms down would mean going the 6-speed route...not cheap.

Good luck and have fun with the mods.....and report back on what you end up with!
EZ