I would agree with HW, it takes some mods to take on a 400ex. Once you mod it so it has more mid and top end power it gets quite easy though.

 

I do remember a while back an artical in Dirt Wheels about FST building up a 300 EX and this bike was awsome. I'll say the 446 Warrior is awsome too but now were talking about spending serious dough, between the both. But stock for stock the Warrior responds better to the normal upgrade mods.