Well... It IS a motorcycle after all
The most common mods would be:
Change the rear sprocket to 43 tooth (JD sprockets for steel ones and theres aluminum from Vortex) since they are so long legged. Its a shockingly cheap and dramatic mod.
Add a quick shifter. You only need the switch as the EBR upgrade will enable the function.
De-noid the airbox (1k ohm resistor in the plug will stop the CEL from activating.
Modify the exhaust to either eliminate the resonator and add tips, or a whole new system from APH or Keda. Be SURE to get a matching ECM from Dean at Keda or Tim at IDS. These don't self-adjust enough to like the mods without tuning.
Since it an early bike (2014 right?) Send your dash and ECM to EBR for the latest updates.
Oil change at 600 miles
There are a couple other little things if you wish like an easy clutch pull kit (I wouldn't), a rear shock coil change from yellow to red (lighter rate by 50lbs(?)) a softer seat at less angle (St1tch) but this thing is a serious performance bike and will never fail to put a smile on your face. Post pics!