BIngo, If you want to , you can use a home-made exhauxt diverter. Thin walled tubing will work, but it should be larger than the exhaust pipe. Here's a diagram of one that I made for my son's first trainer. It was thin walled aluminum, and strapped to the side of the plane. It didn't add much weight, and it worked very well. I think the secret was using the large diameter tubing (I don't remember exactly, but it was about 5/8 tubing), it was about twice as large as the "Tail Pipe" and it allowed outside air to go through it (No tight seal).