Strong Strut body/rear Brace

I am looking at a Strong Strut Body Brace and Rear brace for my M. Any feedback on these ? I just purchased my M in Nov. and it is in storage until spring and I'm in the process of getting it ready for some track sessions next summer. It has H/R coilovers and all bushing are good .
Thanks
Wayne

I have a front Strong Strut on our M Roadster. And a BMW brace on each M3.

They do good things. When I put the one on the E46 M3, my wife did not even know I ordered it, but within a mile or so of riding in the car, asked what I had done to it, as she could feel the difference.

I don't see much purpose in the rear braces in street cars.