Auto engines can't handle WOT continuous.......well subarus sure can.
I've got 30plus yrs flying gyros, soobs are dominant, generally from a wrecking yard, bolt into a gyro. These engines run yr after yr after yr at HIGH rev settings.....example or 2 .....1800cc / EA 81 engines, full power 5000 thereabouts, cruise all day 4600.
2500cc / ej25, full power 5600, cruise all day 4600. Soob engines get massive hrs before you put a spanner on them, it's rare to have an engine out, they just keep screaming.
Downside......heavy little suckers.