Capponi also worked as a developer alongside Gregg Covin. There is also known to be only one narrow body Covin ever made. Some Covin units even run real Porsche 911 engines. Covin (from the Fr. "covine", or "couvine", from Lat. The Covin came in three body styles all based on the Turbo model. As of 2015, the Covin forum has 378 members, 24487 posts, covering 2762 topics. Covin also produced a few 356 Speedster models but these are rather rare.