I had one on an ESM Mustang with a DLE-30. It looked and sounded great! Performance wasn't up to snuff. Other planes at the field with the same engine and prop with the stock exhaust were getting 700 RPM more than me. I kept the scale stacks on the side of the cowl, but put a JTEC pitts on it. I gained 900 RPM. The plane is a rocket now.