I've had this bike since it was new. I have been very happy with most everything so far.
I have been looking into oding some mods, how restricted are the 07's?

What pieces parts should I be looking at changing out for best results?

 

start with typical stage 1, full exhaust, high-flow filter and fuel module. You should talk to Fullsac or Fuel Moto who can set you up with a full package, including a fuel module with the appropriate map.

I would ride it this way to see how you like it and whether you need more. Next step would be cams and headwork. the stock 110 typically need some headwork to really get the most out of new cams.