Second gen subframe to firewall Y brace

[yody]

On nastyz28.com there is a guy there from pro-touringf-body.com that sells a Y bar that goes to the upper control arm bolt and then Y's out the the cowl area and the hood hinge bolt on the firewall. I am thinking of buying this "bolt-on" part but am having a hard time understanding how this helps subframe flex much. THe cowl area has a lip on it, that i suppose you drill a hole through to mount the brace, that cowl area is really flimsy. Also hte hood hing mount isn't the strongest thing in the world. And then the brace only bolts to one bolt on the upper control arm. Just wondeing if anyone sharper than me could point out how they work?