Throttle body spacer

I saw a throttle body spacer on ebay. It says it increases air flow and mileage. I know spacers work for carbs, but I'm clueless on fuel injection. Does anyone think it'll work? Hook me up with some info. I'm runnin a d16z6 with origanal intake manifold obviously.

basiclly they just make the air spin as it goes into the manifold. You see them alot for trucks, supposed to increase torque but I'v never personally used one.

i doubt it hell i still am up in the air about Spoons Ventuli plates.