The scale exhaust looked and “functioned” well on the plane that I saw it on, which was another Mustang with a DLE30 in it. The exhaust "functioned," but severely starved the engine of performance. So much so that my buddy by-passed it and added a traditional exhaust system. Take a look at the Aeroworks version. If it looks like the exhaust isn’t doing anything “unnatural,” it could be worth a try. The version I saw really choked the flow and made it take a very circuitous path to exit.