The TPiS AirFoil is one of the first parts to start the EFI performance movement in the late 1980's. This part is why TPiS exists! It is very easy to install, taking only about five minutes. When bolted in place, the AirFoil eliminates turbulence as air enters your engine's throttle body allowing it to produce more power. In a typical stock or mild engine you'll notice better throttle responce and a 5-10 hp gain and is 50 state legal.