I work in a exhaust shop and we bought 3in shoes just so we could make intakes for our vehicles, my friend got a whole mpg better on his 95 4.9 when we made routed the air filter into the grille, you can also make a heat sheild out of the stuff you can buy to wrap a starter in. In the begginning we made a few out of pvc and rub hose adapters, worked alright. These should be about $50 if you plan it right.