What I'm wondering is, why no one with a SCA bar (manufactured by ProgressTech) has ever had a problem with there subrframe being ripped apart? Lots of people have had the SCA bar for years as it has been around quite a long time.
The SCA 21mm bar has the same problems as the Aussie bar, but not quite as pronounced due to its intermediate stiffness over the OE bar. I've had the SCA bar for 2+ years now and have battled bent brackets and backing plates all along. I've never let it get as far as actually breaking anything, but I'm sure if I weren't so dilligent about bending these parts back every once and a while, something would break, as seen with the Aussie bars.
The SCA bar does need reinforcement for long term durability.
-Kurt