I actually purchased this mount over a year ago for the 04' Mazda 3 but never installed it. Only driven it for a few miles after the install but the car feels a little tighter running through the gears and as other has stated, increased vibration in lower RPMs and when the A/C kicks on at idle. I had inserts in the 04' Mazda3 before and this RMM has less vibration than that. Will report back as it gets more miles.