[spacemanspif]

Thanks guys but I misunderstood my equipment. Turns out that the 2.0 engines came with "tumble flaps" and not adjustable length runners. The 2.3 engines got both the tumble flaps and the runner control. Gotta love the internet for adding to the confusion by everyone using the same name for similar, but different, equipment. Apparently the tumble flaps are an emissions and driveability mechanism, swirling the air and directing it a certain way for a more complete burn. Seems they can be removed but it hurts low end and really needs a tune to compensate.