As I said in the ad, the sound really bugged me. I'm a pretty mild driver and usually take off very sedately and even then the intake growl is loud enough that I hear it. My mpg dropped less than 1 mpg, I believe. I have had it removed a week now and mpg ticked up about .5 mpg since removal so it's really hard to tell. But I honestly like the diminished sound level now. I guess I'm a "geezer."