I have not received it yet...forgive my ignorance. horizon does not give allot of info about it on-line and I probably wont use the parts that come with the engine I'm a little nervous about drilling through them and then using them on my plane, and I already have a drill jig for a ZDZ. I ordered a bisson pitts muffler for it, I almost ordered the can but I didn't want to add any more weight than necessary.