Good question!
I was thinking of adding a two-point STB due to it being a much easier installation. Having to drill and tap the holes on the towers is bad enough, but adding the holes to the firewall is one major job.
This is quite unlike the late 90's Mustangs where, if they didn't come from the factory with the STB, they at least had all the holes pre-drilled and pre-tapped. I added a three-point STB to my '95, and it took about 15 minutes to do.