I did this to my car this morning. Haven't had the chance to put many miles on it, but it feels like the throttle response is a bit better. I'll have to drive it some more before giving a better review. I had the rattling filter box problem like many others have mentioned. I had some rubber tailgate gap sealer left over from a tonneau cover I put on a truck I recently sold. I cut three strips 4-5 inches long and stuck them side by side on the fender well. Then I reinstalled the filter box. That solved the rattling.