Even the stock st stressed the rails, the st would move toward each other at the top. And again the st are still only welded to very light guage aprons and an even lighter firewall. The stock rails are the same guage as the st and in my .02 stock rails still held the majority of the weight.The MII has a much stronger crossmember compaird to the non existant stock one that was simply bolted in.
The stronger MII crossmember isn't holding the car from bowing at the firewall.
Once the shock towers are removed, you can bolt a monte carlo bar in, but you have no place for the export brace to attach to. Okay, so you attach them to the monte carlo bar, the flat piece of sheet metal you've bolted or welded in is supposed to transfer the load to the upper bracing?
The shock tower takes the whole load of the front framerail and transfers it to the firewall thru the short rear panel. Now, you can break a new, full length pencil in half pretty easily with your bare hands, right? Sharpen it down to about 2" long and try it, can't do it? me neither. The tower distributes the whole load thru the whole panel, the replacement only transfers it thru about half the panel, draw a line fron the crossmember to the top corner of the panel at the firewall, that's triangulation. With the MII front
suspension, the front end wants to fold up at the firewall even worse than the stock stuff does. On race Mustangs, you'll notice that the front braces come thru the forewall from the cage, tie into the shock tower than go down to the front of the frame rail. If the Mustang frame tied into the unibody with longer frame stubs like the Camaro then it might be okay, and remember, the Camaro front subframe isn't made up of layers of sheetmetal.
There is no way anyone can convince me that the cutting out of the shock towers and installing a MII front
suspension is stronger than the factory shock towers with the factory bracing, just not gonna happen. Is the factory front end the end all be all? Nope.