From what I heard theres a few ways to go about it... Ive only had mine for a month now and I bought so far ....
Vforce reeds
Lightened the flywheel
Advanced the timing
Rocket pipes on the way soon
K&N air filters
I havent really installed them yet but this is the usual setup people start with. After this youll probably wanna get more serious with a bore and stuff like that. As you mod it more youll realize things dont get cheaper lol