Don ... 8/23/2011
2001 Mercedes Benz SLK320 Base 6 Cyl 3.2L
Hear noise coming from inside muffler/catalytic converter system.
noise is like a something inside the system. I first thought i might need new catalytic converter but decided to investigate possibilities first before i took it in and wound up with a huge and unnecessary bill.
Spoon Sports 8/24/2011
Then its probably a loose muffler (the thing inside the muffler) heard the same thing in my Civic, my car sounded as if she was doing a christmas carol.