Very simply(really not so simply once you read on lol) I want to design a better exhaust system than the typical pitts cans available today
without going to the extreme of having to build a tunnel inside the fuselage, or running a tuned pipe on the outside but yet fit inside a cowl.

Something that will actually add performance to the engines output plus run quieter.
I'm thinking something integral to a motor mount since that's the area under the cowl that makes what I propose next to impossible because of the room its robs.

J'tec has something along those lines but I don't know how well it works. I've never seen one
or heard of anyone that's used one.