Review on Airaid 200 586 PowerAid Throttle Spacer by Ryan Whatley

Installed this on my '06 GMC Envoy 4.2LI that already has the exhaust and cold air intakes installed and I wanted to try it to see if the claims are true. I cleaned the throttle very well when installing the spacer. I will say that I did not hear the "whistle" that many people claim to have heard. I noticed a slight increase in fuel economy per gallon and slightly better throttle response. The spacer did very little but I'm glad I bought it. Some of the claims are exaggerated in my opinion. Overall, I have mixed feelings about this. I stop it because I get a few more mpg and notice a slight midrange change in throttle response.