I removed the fairings and radiator to install my Muzzy system. You may be able to get the header off and on with the radiator in place - but I didn't want to chance damaging the radiator fins.
You will also need to remove the center stand. Muzzy can modify the stand to work with the new exhaust.
I have a few pics of the install here -
http://zoldar.googlepages.com/home
Take your time and you will be fine - Good luck!