what does everyone think of the power commander systems I Have a 2001 CBR 600F4I with a scorpion slip on and K&N air filter do I need one or not and if so what system is the best

 

Power Commanders are for your bike with ANY exhaust..you might even find something there if it is stock since it remaps the fuel injection and optimizes your power delivery

 

there great get one you will love it

 

the pc3 is great you will wake up whatever sleeping horses your bike may have

 

I have curiosity also , does the commander change the mapping alone or do you have to get that done? I've read that ones available with
a usb port so you can tweek yourself !?!?!? Thanks

 

You can download many different maps http://www.powercommander.com/
you just upload with your computer through the USB port....and its re-mapped....
check out the site...under downloads...
Not to sure if you want to be tweeking it yourself....