I still don't know why riders choose to try and find more power when they can't even handle what they got in the first place. Of course, if you are all about pulling someone by a length or two, more power to you. First thing to do is to increase your skill level. Too many squids out there looking bad and getting hurt. On every trackday I've ever been on, I've never been able to use the full power of my bikes to make up time in the turns, where most the time is lost. Bike set up and rider skill is much more important IMHO. The above post is a great way to go. If you want to spend less, go for 1.0 or 1.1 springs up front and set your sag for starters. The front springs are too soft and the rears are pretty close. Reducing unsprung weight is a better approach than any increase in power for handling and performance. From there on, its mostly time on the bike. Good riders smoke exotic bikes all day long at the track.
PMR Components 1" raising links and Race Tech 1.1 springs (and 10w fork oil) for me. 4/1 exhaust dropped about 30lbs.
Reality is - you'll never make one of these into a liter bike. You'll spend a new liter bikes price of mods trying and can make a very nice package or just start with the right tool for the job in the first place.
My riding is mostly 2 up so my parameters are a lil different than before. My choice was make a comfortable bike fast or a fast bike comfortable.
Bike feels much better now - now I need to improve (more).