Installed on a '95 Vandura 3500 (aka G3500).SBC 350 5.7L Throttle body fuel injected.It does whistle the most at about half throttle.I went from an average of 9.5 MPG to 12.9 MPG!!!I think I'll see even more once I remove my winter tires but so far this will pay for itself rather quickly!Click Here to see more reviews about: Airaid 200-540 PowerAid Throttle Body Spacer
Product Description:
The Airaid PowerAid Throttle Body Spacer is developed to enhance off-idle torque, from 800 RPM to approximately 3,000 RPM. It incorporates a patented helix bore, which causes a spinning action of the incoming air-charge as it passes through the throttle body spacer. This improved air-charge carries all the way into the combustion chamber, producing a super-atomized mixture, which produces tremendous gains in mid-range power and overall combustion efficiency for better fuel economy.
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