I've been pondering a beefier rear sway bar for a while now, but the options out there are a bit confusing. I've narrowed it down to a couple that I have based on design + materials. Of all the more Mini Specific tuners, the TSW bar is very nice in that it uses a quiet and self lubricated bushing, but they do not specify what material the bar is or how the ends are finished. The other bar of interest is the Hotchkis "H-Sport" bar. I do like that they use spring steel and give you an option of going hollow or solid. The ends are also forged instead of welded on like many others. They offer 3 sizes with multiple holes for lots of variation, but as TSW states "Anything over 19mm is overkill" and 2 of their 3 are VERY large. I've driven a R53 with a large solid bar before (I believe it is 25+MM) - the car had coilovers and the alignment was all setup as a HPDE car. I thought the car was very snappy and predictable. I did not get to highway speeds, so I don't know how twitchy it is there, but the owner states that it has no awkward tendencies. Currently - my car feels just the slightest bit "lazy" in steering response even with 2 degrees camber up front and 1.5 rear 0 toe front and the slightest bit in at the back. I also have poly bushings at the FCAB. I also think that the rear end has a touch of roll and it I can still feel it push at the front end little bit under power. Smooth modulation on the throttle should have the car going from neutral to a bit of rotation and not understeer to snap oversteer. Hopefully a RSB will help get me in the right direction, I know it is not a miracle worker, but I do have most everything else in place besides adjustable endlings and a x-brace.