The exhaust fumes may be coming into the car and if this continues the hole might get larger and therefore the muffler could collapse and start dragging along the road.
THINGS TO LOOK FOR
Try to locate where the noise is and the best thing to do is to get it repaired ASAP.
Depending on where the leak is. If it’s only a small hole that’s corroded, you might be to get it cut out or replaced. This could cost between $50.00-$150.00 depending on how much of the system needs to be replaced.
This article is found in the Virtual mechanic CD Rom
You can download it for the price of a latte, but you will learn not to buy a lemon
By Darren Gow-Brown, Melbourne Australia ©2009