One thing stands out, none of this makes any sense.
Highly tuned cars, no problems. Highly tuned cars, some with problems.
Stock vehicles, no problems. Stock vehicles, blown parts.
Broken parts, a snapped bolt. Broken parts, everything under the sun being replaced.
There's no way to figure out what is actually going on, with what year vehicles, with what failures are involved, and with the wide latitude of reported fixes that were made.