Has anyone done front and rear Race Tech suspension on their XR400? If so, what was the cost? Reason I'm asking is....I'm looking to buy a 2002 xr4 with $1600 worth of Race Tech suspension (1600 sounds too high). The bike has also has a fmf pipe and has been jetted. The bike looks clean from the pictures. Is it worth the $3800 he's asking for it?