Spyder Lyter and I had the Smooth Spyder Belt Tensioner installed on our 2015 RT Limited yesterday by Outlaw Engineering in Edgewater, FL. We both had a disturbing harmonic belt vibration beginning at 3800 RPM through 4050 RPM which BRP couldn't fix. We tested the tensioner at interstate speeds (68-80 MPH) and the vibration is gone; its like riding on a cloud. After enduring this annoying vibration since the RT-L was new, what a relief it is to have it gone. We would never tolerate this kind of vibration in an automobile, why then does BRP think its ok in a Spyder that costs more that most automobiles?