On my 06 zx10r replacing stock intake cam with a 3rd gen intake cam and installing microsquirt ecu were the best mods, it made a huge difference power wise, a difference I could feel, gained at least 4mph in a 1/4 mile.
https://youtu.be/XvlQrhHZOvg Here is a video on the intake cam upgrade.
https://youtu.be/XvlQrhHZOvg Here is a video on the intake cam upgrade.