For those motorists who have old machines and repair them personally, can be useful advice on how to restore burnt-out muffler or pipe to it.
The edge of burnout, you need to lubricate silicate (stationery) glue, them soak a piece of fiberglass or asbestos and wrap the repaired hole, and the top is further to apply a layer of the same glue. After drying patches (possibly by running the engine) the muffler will not worse the new.