I also got the inverted pitts and inverted muffler for the 26gt. My plane has the inverted muffler on it from brisson becuase it fits in the cowl for my application better. If you would like to get a $100.00 inverted pitts for pretty cheap that still NIB let me know, I don't need mine mine. Brisson said they both will produce the same amount of power (when compared to each other) but make sure you cut the turned in tips off the pipes.