I have a '97 Audi A6 Quattro. I love the little car, until last night I was driving home and it sounded like my muffler had a huge hole in it. I got home but wasn't able to check it out, this morning the noise is still there but then I noticed that the noise lessens once it reaches so many RMPs. I don't know much about cars, I know the basics. I don't want to have to go to a dealer and have them look at it and rip me a new one. Any ideas what could bring this on?

Let me also say that this started at the same time that my headlight icon stopped lighting up and my sunroof control panel keeps falling down. Yes, I checked to make sure the contacts were all connected. Could that be a fuse?

Any help is much appreciated!