Mid engine would be sweet! If I was going mid engine weight wouldn't be much of a concern, so I would be lookin' at a 2.2 turbo or maybe even caddy northstar . But nah, http://www.kennedyeng.com makes adapter kits to hang just about all the Subaru engines off the back of a VW transaxle, plenty of other engines too. I'm interested in the EA-81 because its size, weight and power are very similar to an air-cooled VW engine, and I believe it may be cheaper(after initial adapter purchase anyway) & more reliable.