The Extreme Cap will get a BME 44. Got a call from Keith yesterday and he had a slightly used one. Should be here monday and I should get to mounting it next week sometime. I will post some pics then. The 44 will get the BME bango muffler so no firewall mod is necessary. If anyone wants to see the firewall mod let me know and I will pop the cowl of of the Cap X and post those pics. Almost forgot, the rudder servo tray should be attached with 2 pieces of triangle or square blocks underneath at each end. There isn't alot of surface for epoxy to grab on to and after 30 or 35 flights on the Cap X mine popped out. I actuall used the wood blocks that are used for pulling servo leads for the ailerons.