996 Muffler Interchangeability

[dwightolson]

My 1999 996 has developed a tinny resonance at mid RPM acceleration after it is warmed up. Sounds like the right muffler has something loose in it. Is this a common problem? The car has only 30K miles but it is 7 years old.

I found a set of slightly used stock mufflers from a model year 2000 that I'd like to try. The Porsche on-line parts catalog shows a slight difference in part numbers between the 1999 and 2000 up. The 1999 part numbers end with "56" and the 2000 up end with "57". There is no symbol indicating supersession in the catalog that I can find. Both are for 6 speed.

Does anyone know the difference between these two mufflers and whether I can use the 2000 up version interchangeably on my 1999? I suspect they must be similar since some of the aftermarket mufflers seem to use the same part number interchangeably on model years 1999 through at least 2003.

Thanks very much!

Dwight

[Loren]

Check the heat shield around the muffler to make sure it is not causing the noise. If it is not the heat shield or loose hardware then chances are that it is a broken weld in the muffler.

As far as I know any standard (996) muffler can be used. If you have the PSE (Porsche Sport Exhaust) that is not the case. You do not want to mix the small tube PSE with the large tube PSE.