I have borrowed a Pitts style muffler but the exhaust pipes are in the cowl so I have to extend them with those flexible exhaust tube. But I'll come back when I'm in that area again. Still need to finish the wing with ailerion so that the fuselag fillet can be glued together. Everyone that I have shown the pictures or the real plane says fine but you can't fly it because it's a hard plane to fly, but what I have read from Adrian reply's that they don't know anything about it. Rudder movement shall be 22mm up and down and I think people have more.