One of the guys who joined my EAA chapter several years ago had a Quickie 200 project that he had been advised to buy a "Subie-Lyc" engine conversion for. I'm not sure of this was an EJ-22 base engine or not. So forgive me if this is talking about something vastly different. The amount of work that he had to do to get all the boxes and wires and hoses and coolers and connectors and everything else into that cowling was incredible. Although not by any means the engine's "fault", he also spent a year with an engineer trying to design and build a radiator cooling system for it. This became very complicated, again more because of the airframe and his desire not to have a huge radiator inside the cowling. He finally built a really magnificent looking system with two radiators on the sides of the tailcone, similar to half of a P-38. To my limited understanding, the Subaru is a wonderful, reliable, and high quality powerplant. But as another poster has pointed out, the actual big heavy moving parts in the engine are rarely the cause of an operational failure. It's the various systems and electronics, little plastic automotive parts, wires, and hoses that cause problems for these engines. As much as I appreciate and support the development of alternative engines, at the end of the day the reliability of the entire aircraft and all of its systems is what determines how often you land in someone's farm field or back at your home airport. And for whatever reason, and because of whoever's fault, some of these ancilliary or secondary system issues have caused more than their share of operational reliability problems. So an engine that does not need or use those components is still preferable to many people for a good reason. I would LOVE for the brilliant work and efforts of rv6ejguy and William Wynne and Jan Eggenfellner and others to prove me wrong on a "big-market" scale. I would stand up and tip my hat gladly if their work managed to eliminate the problems that come out of auto engine conversions. Unfortunately the Quickie Subie-Lyc engine installation never progressed to engine running tests, and the airplane never flew. My friend passed away in an unrelated aircraft accident and the entire project was dismantled and sold separately.