The only "must" is must throw out the k&n.Thanks for the reply. Is it a must have? I'am not looking to get every last horsepower out of it , I just thought it might be a bit lean and dont want it to pop because I beat on it pretty hard.
Mine came with k&n's ,ive had the box off many times and it fits fine.The airbox doesn't even close correctly with K&N filters as you probably noticed when you installed it. That's just unexceptable.