I installed the Econoaid throttle body booster and no kidding I'm getting 3 mpg better on my 5.7 hemi Durango than before. Between the aFE intake magna flow pipes and this I'm now getting about 17/23 vs 14/20. The biggest part is the little booster gasket for $30.00. Power wise I can't tell much but that's been covered with the other mentioned parts. Get one!
You have to know ur engine to feel this very minimum throttle body booster. First thing I notice was my idle seemed a little bit higher and I didn't feel anything on the gas pedal until around the 45mph and it so slight that I don't know if its really working like it says it supposed to do, but for 30 dollars and 20 to get installed wasn't too bad. I live in California so strict carb rules is why I had to try it and it was built in U.S.A. I installed this in my 2011 Camry SE 3.5 V6