A tuner with O2 sensors would be a better option IMO but it would cost more. On your 04 bike a tuner that controls the injector flow would be a good alternative and the a good dyno tune to adjust the timing. A tuner that doesn't utilize O2 sensors will just adjust the air/fuel ratio but the biggest issue with installing new cams is the timing and with the computer that's in the 04 the best way to adjust the timing is by doing a dyno. Keep in mind that the 04 computer is a dinosaur and it just doesn't have the capabilities that the new computers have. 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.