What the manufacturers do/do not do really doesn't matter.
Have you seen the video of the LS1 Trans Am that blew a clutch while the guy was doing a burn-out? It basically totalled the car...
Things happen and I wouldn't want a piece of cast aluminum between a flywheel and my legs.
Also, keep in mind that the 2001 Mustang Cobra R had a Quicktime bellhousing....
