There was actually a couple different number 11’s
But the one that you’re talking about I modified. And because I modified it, it’s now labeled as destroyed or the frankenstooge, whatever people want to call it. But basically I modified the frame so I can add W concave. And I added a new top cover with W concave. And a lower cover with a little more clearance for my batteries. Then I added different heims to give me more turn. And a few other things like single motor, dual wheel drive on both front and rear, to make it an all wheel drive beast.