I also use a little high temp sealer around all my joints of my mufflers. I never tached my engine with the baffle. I never even run the engine with the baffle for that matter. It weighs to much and I wouldn't want to add any useless wieght! Seriously though I run a 12-4 apc and an 11-5 or 11-4 MA plastic prop and always had plenty left for pull out of a hover. The knife is the plane that I learned the old Bang your rudder trick with. Now I have learned a gentle touch is much better! I have also heard you can buy the muffler for the tower 46 which only costs 12 bucks shipped, and it will give about 400 rpm over the stock baffleless muffler. Its only 12 bucks. I would buy one but I am currently with out a 46, as I have sold mine. I am waiting to see if the OS 50 will come down a little in price.