I duplicated the length of the intake runners inside my airbox but they are really close to the end of the airbox. I think I am getting restricted flow into the runners. I figure if I cut a 1/4" off the runners I should free up flow noticeably. 1/2" should be most I'd have to shorten them. I bought a SpeedoDRD ( same thing). Thunder says I can't work on that until I get my neural light issue fixed so this will have to wait.