In a carburetor, the air and gas mix and then is fired. Those were directly replaced with throttle bodies for a central fuel injection. If you create more air turbulence, then you get a better mixture. The TBS is designed to spin the air as it enters the throttle body and improve the air mix and burn better. That was why they added power on older engines. On a modern engine, the fuel is injected directly into the cylinder. So spinning the air shouldn't do much.

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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
All mod descriptions and pictures © 2007,2008 by Toxarch. They may be copied only for personal use and the mods may be done for non-profit only.