Corksport
There's two settings, 114% stiffer than stock and 180% stiffer than stock, I'm at 180
10/10 I remember saying "Damn that's nice" during the first corner after install lol
Like most ms3 owners I started with an upgraded rear motor mount then proceeded to keep throwing money at the car when the modifying bug bit me. This is the second car I've ever owned, but first performance car so I have a ton of learning to do which is exactly why I'm here!