05 was the first yr. for the 100 ci hammer only
06 all bikes got the 100 ci 8 balls had 5 speed all others 6 sp.
08, 09, 10 hammer, jackpot, vision got the 106 ci , vegas, kingpin 8-ball 100 ci all have closed loop fuel injection and therefor different pipes, different mapping codes
the 50 state bike refers to calif as we have even stricter emission standards.
but not to worry when they pass cap and trade , which deals with green house gasses you too can have an underpowered shitty running car, bike, truck
i believe this is correct if not someone chime in