Zac you are not just whistling dixie. I have a 40 with a tuned muffler in a Sig Midstar 40. It gets right with the program. Power out the wazzo on 10% fuel. They make a 49 that would fit under the cowl. If you modify the fuse some you could tuck the tuned muffler under the plane. It would indeed make that puppy go.

Bret the Webra would also be a great choice. They are a very,very strong engine. Seriously overlooked by most people. They do not get the recognition they should. Good luck with whatever engine you get. And good luck with the plane.

Mark Shuman