If you go with bigger injectors you will need the 58mm throttle body. IMO you will get better performance with the stock injectors and TB especially on the low rpm power band. I had a 103 big bore stage 4 in my bike with the 58mm TB and the bigger injectors and I wasn't happy with the set up so I went back to the stock setup. JMO
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.