I didn't expect that much change...I also cleaned the inside of the cover up under the little cover plate they have covering the CCV and the outlet with brake cleaner couldn't remove the plate but sprayed the crap out of the openings and watched it run out it was kinda gummy in there but still not as bad as I have seen on other engines, and again the result is night and day...I know a lot of people do a little mod or something and say I feel more power or I now get 100 MPG's and I also know most of that is the "placebo effect" LOL...but this was a pretty big improvement that I did not expect...