I figured out my elevator problem and of course it was something stupid on my end so thats solved. Horizon sent me a new wing after calling them but sent the wrong side. Would'nt you know it. I talked to a pro builder and he said dont worry about the small gap that it will be fine. It's not like we are flying pro competition and we wont notice anything from it anyway chances are. I am beefing up the landing gear area inside the fuse. I wish I had an answer for you about your muffler but I dont. All I can say is I like the pitts style but I'm going to use the stock muffler on my Saito 125. Any build tips anyone would like to add please do. Thanks to all and happy flying!