I just saw this on t4r the other day. That forum is 99% garbage but by shear numbers they hit the mark every once and awhile lol.
http://www.toyota-4runner.org/3rd-ge...-3rd-gens.html
cheapest I could find is $135 with free shipping
http://www.ebay.com/itm/like/111529771783?lpid=82
You can see the fit is not perfect, but nor has been the fit of the custom ones I've seen over the last 6 years. Ive read in the past that these cheap ones are prone to UV fading so figure in a $3 can of spray paint down the road. It dosnt address the concerns of breaking it on a rock due to the outside routing, but at least its not $400 if you do shatter it.
I still like the idea of the active dust filters and the bowls, but when I looked into mounting one on the hood there was a space problem for one large enough to feed the 3.4 at open throttle. This would work to get a fancy topspin up high enough to clear.