Forum post:
"Hey, I got an MBC, i set it to 25psi on stock everything"
week later...less maybe...
"OMG IS MY MOTAR BLOWN?"
It's usually ignorance, same with any turbo car...DSM for a fellow example. Actually any other car. Something stupid, like dialing the boost up insanely high on stock cars will blow it up eventually. Sometimes motors just get old and die, and need rebuilt.
Non-manufacturer swaps...light chassis, great handling, cheaply obtained.
Also, rotaries are put in everything as well. Bugs, civics, corollas, miata, hell, I think Alex from OhioRotaries is putting one into an Isuzu Impulse. They're usually thrown into lighter shells for race motors because they can last during endurance races at 8000rpm.