Just upgraded stock exhaust to PSE on a 991.1 C2S. I have about 2k miles on the new exhaust and notice a rather tinny rattle at low rpm and idling. It does not happen all the time and I can get it to rattle with the valves open and closed. Any one ever experience the same or have any ideas?

 

I believe I have the same issue and it's starting to get on my nerves. Now that you mention it, it doesn't happen all the time (even at cold start) which is bizarre.
I stuck my head under the rear and hit a bunch of things with a rubber mallet to see if there were any obvious rattles but didn't see anything.

I'm unsure if it's PSE, the headers/cats, or the muffler. I'll be changing out the header/cats hopefully in the next month (or so) and will be paying attention to whether that fixes it.

 

It's a typical sound of these cars with PSE, just the harmonics at play.
Mine does it including a friends, l'm not really concerned

 

Thanks, appreciate the feedback. Hated to think it was just me and mine but find it a little strange considering Porsche has by far the best build quality of any car I have ever owned.

 

Just wanted to follow-up for anyone following this thread. I just came back from local shop and had them check the rattle. The found the PSE exhaust tips and cover had become loose. Tightened down and rattle gone!!

 

I need to take mine in for I think the same rattle. It's either the exhaust or one of the heatshields somewhere.

 

Could be the tips themselves. They’ve been known to have a rattle. Consider starting the car and placing your hand around the cold exhaust tip to see if the dampening stops the rattle.