yeah it did, also did the airbox mod and new spark plugs & went to synthetic oil. so cant say what did what. but my mileage went up about 2-4 MPG overall. Its hard to stay off the skinny pedal though
or see what to top end really is. 140mph according to the handheld GPS. And still had some throttle. Oh did I tell you I LOVE the big open roads in Texas!