The black Master Airscrew if 10-6, it is the same as the prop in my tests, ya, the more the merrier. I would like to know just how much greater the Jett is as well as pretty much everything that size. Especially with no muffler, as the results vary so much. A Jett muffler can make any strong motor even stronger too. Using a pipe is so variable, that the results would not prove much, but a Jett pipe would be good. Wish I had one.