[jeverett]

Helix, PowerAid, and a few no-name brands are available to purchase. Usually the prices range from like $35-$75, depending on the brand, and the application. What a throttle-body spacer is, is a 1" thick plate that mounts between the throttle body and the intake. It is supposed to smooth the flow of air between the throttlebody and intake and make the engine get more air. It also gives the air a swirling effect as the air passes through. Usually the effects from having one are increased throttle response, increased mileage, and a bit more power. There is only 1 negative thing that I know of, when installed, it gives your vehicle a kind of whistling sound, like that of a supercharger.