Well prior to pulling the airbox, the carbs were sandwiched between the engine cylinder and the frame mounted airbox. When the airbox was removed, that left everything hanging off the backside of the engine without the airbox to stabilize everything. That's the reason everything moves around with the 0990 filter. It would be great if someone could fab up a bracket, but in lieu of this happening anytime soon, 2 tie wraps seem to stabilize the carbs just fine.
I like the runners as they move the filter back a bit and also angles it down and to the side. I haven't ridden the bike to see if the additional short runners make a diff... I just hope they don't hurt. After reading Duck's experience with different length runners, I frankly don't know what to expect. I'm hoping the engineers at Kawasaki did the math for me and that putting the stock runner length back on will help get some low end back.