Has any one fitted a stage III upgrades to their bike? would like to know how they go compared to stock and are they worth the coin. at the moment I have VandH long shots and SE air fliter and tuner, any input would be great.

The stage 3 kit would rip shit if its set up correctly but most shops just build out of the boxes and never blue print the engine for maximum engine efficiency. The basic kit could give a 40 hp gain with the right builder, tweaked heads, exhaust and tune.