I have a 1973 with a factory correct 1974 muffler. As indicated elsewhere, the insides are the same - it's just that the pipe bends lower down (for '74+ bumpers).

I haven't found a good used one to buy yet (open to anyone who has one to sell).

Porsche does sell a new one. Does anyone have any thoughts on the quality and how it compares to old stock?

I will say that I did buy a new muffler from the factory for my 912. It turned out to be just the latest Dansk muffler - which is known not to fit very well. I returned it, and now happily have the correct original factory muffler on the 912. So I'm worried that the current 911 factory offering is a similarly lower quality Dansk.



Also, the factory lists the part number as 911-111-025-00 and superseded by 911-111-025-05. Does anyone know what the difference is?