Just got my 919 last season and can't be happier. Now on to customizing it!
Congrats! Got mine last year as well and it's been amazing. Here's a couple of things I've done to mine, and a couple things I've found:
Dirt bike bars and grips - Better control and feel all around
EZ-Pull clutch lever
Vapor Speedometer - Great unit at a reasonable price. But also my bike didn't come with a speedo, sooo...
Dunlop Sportmax Q3s - I posted this on another thread, but these tires are amazing all around, extra sticky and decent tread life. Excellent if you want to stick in the corners on a hard ride, and also pretty solid in the wet and around town.
These couple of simple mods make this thing ride like a supermoto with a CBR motor. You can go crazy tuning up these bikes, but you don't have to do a whole lot (or anything at all) for a 919 to be a complete blast.
Food for thought: I plan on getting pipes for my Hornet, however, the amount of s**t I've gotten away with on the street over the past year is unbelievable. When cops don't hear that sportbike noise, they don't pay attention...
Have fun out there!
“Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming "Wow! What a Ride!”
― Hunter S. Thompson