I've never heard of them cracking, but I have heard of the shock towers actually being ripped off the frame
I think anything you can to do keep those towers from moving in relation to each other (what the whole post is about really) would prevent it from happening.
As for fixing it...I don't know other than just welding it back assuming it's not bent permanently.
I'm surprised there haven’t been more people posting on this having been up for a whole day already. I'd think most everybody with a strut tower brace or other frame strengthening bit would chime in...
I guess my posts are too long
