(QUOTE) BTW mishifting is possible , but hardly from 5th to 1st. And it can destroy an engine , pulling the engine to match road speed and RPM to something byound the preset redline. Bang. Is this the case for failed engine ? the thread starter wont say.[/QUOTE]

Mis-shifting is ofcourse possible, as you say not at 100km/h from 5th to 1st. But I don't agree that you can go beyond the rev limiter without fiddling with the computer.