Phakur, I put a DLE 20 in mine after I put a OS 4 stroke in it. I was bummed that I didn't just get the DLE first, the DLE fit better and I would have had less and smaller holes in my cowl. Once I get my engine back from hobbico I will post pictures if you want but it does fit nicely inside the cowl and you could probably use a piece of flex pipe to route the exhaust out the bottom back part of the cowl. I didn't get the flex pipe yet because I wanted to get the engine in and get the plane up in the air a few times. once I do that I will get some flex pipe and route the exhaust that way.