Damn, somebody gave me an airfoil for free but it doesn't fit. It fits into the throttlebody but the hose is too small. Anybody else have this problem? It's a large plastic piece about 5 inches by 3 inches, not the smaller ones that screw into the TB.

 

If it's the one I'm thinking of it fits inside the rubber air bellows. The slots fit inside the grooves of the bellows and holds it tight against the TB. I think its a JET brand.