As described in the old topic, Big Gulp, I spent about an hour and a half standing the air Inlet for the throttle body inside of the airbox, got rid of that 90 degree Edge on the opening and rounded It Off. It's raining now so I'll have to wait for a test ride. Still have the stock size K&N filter in the Box along with the Hitchcock's aluminum Big Gulp cover that goes on the air Inlet on the box itself.