ltr jet advantage?

[tub350]

hi, i have a 2001 ec250 current carb is set up with 178 and 38 jets NC1ED needle no7 slide air screw out one and a half turns, riding around 880ft above sea level. the bike seems to run ok when warm, it even idles, bit hard to start cold but. however it has no top end, what sort of improvement would the LTR jet kit give me?? and the better question is, anyone know where i can get one in australia or someone to get it off in the states??
thanks in advance...