I don't have any way to do any legitimate testing on my car, but I will tell you that the MM STB I installed on my car helped quiet down noise and reduce the "shock" felt by hitting large bumps in the road. The speedbumps at my apt. complex are now not terrible to hit. Still a solid "thud", but it's not a "bang" as before. The subframes reduced it a lot, and the STB took it further. It's especially noticeable when only 1 wheel hits the bump. Take it for what it's worth, but I noticed a difference. Granted, the MM STB is a 3 point. A 2 point would not do much, if anything, for any car, IMO.
1993 Mustang GT - Sloppy Horse - SOLD
1994 Mustang GT - Dedicated Racear - Full MM catalog with 03 Cobra IRS - Codename: Rigid horse