Buy a KTM.. thats the best dirt mod you can make to a XT660R..
A XTR is what it is... They are a OK bike if used with in there abillity
I use my XTR mainly for easy dirt tracks & gravel back roads..
I looked at a shock & converting to a USD front end..Not worth the $
so put a 22l tank & high 2 into 1 pipe... It works Ok for what I use it for now..
I have a XR250 for the real fun stuff..
I fined thats the best option If yer want a XTR and want to ride dirt
have 2 bikes..

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...