I believe that what you are running into is the difference in cylinder heads brought about by the change from carburetors to fuel injection. They use different intake manifolds and the pre-heaters which come off of the exhaust system change configuration - thus the change in the muffler. Is your motor a fuelie or is it carbureted? Take a look at the base of the generator/alternator stand and you will find the engine number. It will likely start with the letters "AE". Post the engine serial number and you can determine the real year of the engine and what exhaust it should take. The pre-heaters are not a "pollution thing". They take the hot exhaust stream and run it next to the intake fuel mixture going to the engine cylinder. This helps to prevent icing; at least in a carbureted version. I'm not familiar with fuel injection systems but I know that they are different. Ceramic coatings are neat depending on the cost difference from the standard versions. In the application that I have, a summer cruiser, I am content with a factory exhaust but with the use of "J" pipes as I have no use for heater boxes and all of that foofera. When you do your exhaust work, be more concerned about things like seized stud nuts at the point where your pipes go onto the heads. And when you put the new nuts on, use a bit of Never Seize compound. Some day you will thank yourself that you did. Dan (MY72BUG) in Goderich
I'd rather have a partial bottle in front of me than a partial frontal lobotomy.