I tried this same setup in my Civic, but for some reason it dropped my MPG. I just removed the flexible piping, and now I just have a large hole in the side of my intake where the cool air tube and resonator used to be, and I get much better mileage now. I figure it's pulling in warmer air from the engine bay, but not getting the extremely hot air from the headers. Seems to be a great compromise for my car