I installed these at the same time I installed a group N transmission mount in my 2019 WRX as part of a refresh project. On the first drive, I did notice an increase in NVH inside the cabin, which can likely be accredited more to the transmission mount than this kit.
That being said, when combined with those, I've noticed less slop with my shifts and it feels a bit tighter to drive. Compared to the old bushings which were super soft, these are much more firm.
For some, these along with the group N trans mount might increase NVH a bit much for a daily driver. I'm transitioning my WRX from daily to track use so