I bought 3" ducting for an RV(6' long) for about $10.00, zip-tied in to gap in front bumper and under-carriage. Covered the gap with mesh/grille from Home Depot ($6.00) so I don't have stupid-looking hose sticking-out the front. I have noticed definite gain in pick-up as there is limited natural air flow in engine bay. Besides the limited clearance underneath, it is a cheap & worthwhile mod...a poor man's cold air intake!
