Couple Questions here... 97 CBR600F3 here

Factory Jet Kit Config 30 says it's for an aftermarket exhaust and stock or mod'ed airbox for higher airflow. Would a K&N filter work in this case?

Would there be any significant gains by adding a full exhaust, Factory Jet Kit, and K&N filter to my 97 F3?

If so, what exhaust performs the best while staying street legal (noise)

I'd say 5-10 HP. And yes u wil be able to notice the extra HP.

With just a K&N and a vance & hines slip on I noticed a decent increase in acceleration and power. My next step will be to swap out the stock jets with a dyno jet kit to take care of the lean-ness and improve throttle response. I wouldn't reccommend keeping stock jets with a full exhaust and a filter. Our bikes run lean from the factory in order to pass emmisions in some areas. By adding more air flow we lean them out even more. I am already trying to decide if I want to risk waiting till winter to tear mine apart to rejet it. Hope you don't burn a valve.