Excellent mod. Revised bumpers for the 800 would be a bonus for all terrain variant. All terrain traction control that mimics locking differentials by braking individual wheels (more than it already does) would be great to see in game if possible.
What it's missing is for the exhaust to have an effect on the 3 cylinder. It's considerably louder than the other engines and the exhaust doesn't give it a more muffled and quiet tone like it should. That's the only reason it isn't 5 stars :)