The Raptor Rocks and i ride mostly the same kinds of areas, I have a z400 wich is a great bike also but to me it feels alot like my 400ex i had before my raptor
A raptor with a pipe,filter,jets and possibly a cam feels like riding a street bike with four knobby tires
i have not modified my z400 as of yet but i normally go by this rule of thumb
there is no replacement for cubic displacement
Keep The Rubber side Down!!!