I loosely installed the CKT Muffler and Exhaust Pipes onto the Rotax 912 ULS engine. Since I haven't figured out yet how I will be connecting the Fuel Lines to the Fuel Pump and to the Carburetors, and they pass under the Muffler, I decided not to fix the exhaust system in place. Each Exhaust Pipe is match numbered to its corresponding exhaust port and everything fit really nicely. 12 July 2016 update: to install the hoses to the Fuel Pump and to the Carburetors I took off the Muffler and then re-installed it with some Permatex Bronze Anti-Seize on the four ball joints. Since I am sure the Muffler will be coming off again I have not yet installed the four Tension Springs and Hi-Temp Silicone.