Just finished the exhaust donut change, and it was a learning experience. There is a easy and a hard way to do this job. I have 13000 km on the sled and the 2 gaskets on the clutch side were shot. Sled sounded like there was a hole in the muffler. Changed all four gaskets without taking the exhaust apart. After I finished, I fired her up and it again sounds like a throaty mustang, that I have grown to love. If anybody needs hints or help just drop an email, or whatever.