Since last time out I found a bad coil wire so installed new wires then this vibration has been plaguing me for years but just got REAL bad. Aero tricks to relieve pressure in the rear and an air damn in ft plus removed the turbulent 6-pack scoop and finished my sealed/damned air pan.......... And 17 lbs removed fwiw............. Check out my FB pages.....Dominic Thumper or ThumperCarbs then you can see all of these changes...........