Erans, not that you will need more power but I have the same muffler on and Evolution 35GT in a GP Super chipmunk and I cut off the ends of both pipes. The part where it curls in. It made is louder but gave more power. I have the Waco with a DLE30 and I can 3D it if i wanted to. It is a nice flying plane. it does not like cross winds but overall is my favorite plane in the hangar.
