My 2014 RT exhibits an anyoing engine vibration coming off idle at around 1200 RPM. It is NOT belt related since it occurs when standing. It is especially annoying when starting out. At idle it is smooth, but going through 1100 - 1300rpm there is a slight vibration, then everything is smooth again. I do have a belt tensioner device installed, but again the vibration will occur when standing. Maybe the 1330 is so darn smooth, I'm just being picky.