I'm trying a saito 120s in my showtime but with only 5.5 inches from the firewall to the drive washer does not leave enough room to use the stock muffler. If saito made a 90 degree exhaust adapter for the 120 as they do for the smaller singles then it would be no problem to use the stock muffler as the elbow and muffler combination would clear the firewall. So, I turned to the saito flex muffler at about $40 more. It too, after installtion barely fits. The one I purchases had the pressure nipple on it. The prossure nipple is in the wrong position that I need for the showtime and it is not moveable. I tried to bend it down more closely to the pipe to gain more clearance without kinking the tube. Now, the pipe barely fits with the pressure tube rubbing against the firewall. I then bent the tube under the fuselage and still requires a cut in the bottom left corner of the cowl to clear the protruding pipe from the inverted engine installation. Does any body know a clean way to secure the bent portion of the pipe to the fuselage? Mine is just hanging there for now as there is no mention that it should be secured. Trying an APC 16X8 for the first flight.