When I cut my car off the exhaust makes a farting noise from what seems like around the muffeler area. Could I have a hole in my exhaust, I really don,t here any hissing noise like an exhaust leak. I took a peak under the car around the area the noise was coming from but didn't see anything(I could have missed it if it was on the top part). It doesn't happen all yhe time, it does it the most after I have been driving hard. Any ideas?

 

Bump....