I came across this engine, which is used in the Celera 500L, but is also offered for other applications (I've seen a DHC Beaver and a crop duster):
It's a 6.1 l V12, twin turbo diesel engine. Rated at 550 or 600 shp.
View: https://www.youtube.com/watch?v=y2WZJJ5IzMU

It's a 6.1 l V12, twin turbo diesel engine. Rated at 550 or 600 shp.