The spacer is supposed to rotate the air to help it flow better or something like that. I have no experience with them. Most of what I read said it doesn't do anything on fuel injected engines. You just end up with a whistling noise from the air going over the rifling on the sides.

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2007 SR5 Crewmax 5.7L 4x4
Mods: nerf bars, Truxedo tonneau, radar detector power, fog lights, black billet grille, rear differential breather, parking sensors, Line-X, power tailgate lock, hood safety latch mod, one off driving lights behind grille, Pioneer NAV w/ OEM camera, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI
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