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I don't think the 150mph speed has anything to do with it.
If you drive 80mph for 2-3 years of ownership it's going to eventually crack due to the stress.
just like the b pillar sail panels on 3rd gens where it met the roof would crack and have to rewelded/brazed. Years of the body flexing would cause a crack at the weakest point.
And don't forget about the '80s Mustang GTs that had the floorpan cracks.
If it's not strong enough there's going to be a failure somewhere in the part.
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