Regarding fire suppression and these cars: At the risk of seeming "dangerous", I really doubt Subaru guys will need them. You likely don't carry an on-board extinguisher in your daily driver, and you probably don't have one in your shop. Computer-controlled cars don't buck and spit and fart like older cars. They don't typically cackle on trailing throttle, or sneeze when warming up. They have no idle jets to plug, no cheesy points replacement modules to loosen up in the tiny distributors they don't have.
Alternately, it's the "simple" cars that burn, especially when maintenance isn't fastidious.