I'd do the reflash first and foremost before anything else. Reason being is your bike as well as mine comes restricted stock. Your going to end up reflashing it down the road anyway if you don't do it now. Why mod your bike without having it unlocked first of all. Then once you get used to how it runs after the reflash I'd go with the c/s combo. A 520 kit would be great. Just make sure you maintain the chain well with proper cleaning and lubing. Hit up Corey with Motomummy. He's been posting on here as well.
+1 on this! I did my 520 -1f/+2r c&s combo, gutted my stock mid pipe and my flash tune all at the same time and first time I took off from a 50 roll in first I almost wheelied so hard it could have back flipped. Wasn't what I was expecting. There is more to the reflash than most people realize with these yama's the electronic throttle and engine breaking feature is by far my favorite. Not having the bike nose dive under decel, bein able to control smoother downshifting and rev matching and being able to really power through the corners faster, more consistent and smoother. I have probably reflashed my ecu over 150 times since August tweaking and modding stuff across the board
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2007 R1, BMC filter, NGK plugs, Stock cans with A&R baffles, Mivv Y pipe, -1F/+2R sprockets, Flash Tune interface, Zero Gravity Corsa windscreen, 35w 8000k HIDs, 520 EK chain