I have an '05 Road King Classic. I was talking to a freind who sold his '04 RK and picked up an '06 RK Classic. He mentioned that his '06 seems like it has "a lot more power". I asked him why and he said the air regulator is bigger,more air intake, and that it has an different type of injector. I've been busy and haven't had a chance to ask the dealer about this. Both bikes have the stage 1 upgrade. I had S/E's put on and he had V&H's put on.
I'm just curious..

 

Larger throttle body and redesigned cylinder heads for '06 = improved performance.