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!