from what i saw at the teryx forum ride. the interior is very well lad out the hole thing is new, seats are a lot more comfortable, I'm am 6'5" and fit easily in the back seats, the engine is all new as well as the clutch which is super responsive and the extra power is noticeable even with 4 big guys in it, all the drive line components are built up, larger u joints all new diffs, larger radiator, cvt intake is now under the dash, and the air intake filter is under the hood, don't know how the stock suspension works being throne that came out was LTI's and had their long travel on it. it definitely going to give the RZR4 some competition.