i will say that for the past 20 years of my life my father has run K&N's on the RV's including the current v-10, and they all performed beautifully.

i dont know about the vans, but i heard that the stock air filter setup for the superduties and OBS 7.3 trucks were able to sustain 300hp before you started to see negative pressure in the pre-turbo intake. this is just what i HEARD, so take it how you will. its a plausible claim i think.

dave i am surprised there isnt a larger aftermarket selection for you, i never looked but i assumed there would be more. an email to AFE or another company may get you a replacement filter that you dont see listed anywhere...maybe?