no idea if it would bolt up? not likely without mods
as it was made for a 06-08 KXF450 chassis.
i'd highly recommend running any brand or model 500 silencer though..
(KX, CR, FMF, PC ,stock,what have you )
as the diameter of the 250 stinger and silencer core ,
is much smaller that the stinger on the 500 pipe?