hey man, i slapped my set on this summer and the powerband is crazy..., from mid to top end its like a missile, but the bottem end isnt as good as i hoped, i dont know how hard it is to fix, but im in the process of advancing my timing and increasing compression with aftermarket heads.. that may help it out a little
i havent tried the fattys before so i dont know if there is a difference
yes, they do come witha jet kit, filter and airbox vents , i think mine came with 280 and 300 mains with new needles and c-clips
hope this helped
Matt