RallyMini, I just installed the 19mm on my Cooper two weeks ago. I installed it by itself and drove on it for a week, and loved it. Then I had the 27mm front bar installed last week, and the 19mm rear bar is significantly over-powered. The car felt cool for a couple of days, but now I realize that it's completely unstable. If you're installing the H-Sport set or "TVS", go with the competition package. Even with the rear sway-bar on the loosest setting, it will be a major improvement over what I'm suffering with.

The car has broken loose 3 times, and almost put me into an embankment last night. The stock suspension felt stabler.

I plan to ditch the 19mm bar as soon as funds become available.