Review on Airaid 200 586 PowerAid Throttle Spacer by Larry Boyd

Fits my '07 Pontiac Grand Prix GXP 5.3L LS4. Slightly increased torque, an additional 4mpg savings and a slight whistling sound as if the turbine is spinning behind the volute. Installation was quick, all hardware and instructions included. A good time to clean your throttle body while you take it apart. The machine runs more smoothly because it doesn't have to suck through a straw, but through a garden hose. Increases the compressor volume to 9 cubic inches, which is worth the money. Look at your intake, if the throttle body opening is less than 2/3 the height of the intake manifold it will do you good.