I noticed that my passenger side exhaust was louder than the driver's side while driving. While idling, placing my hand near the exhaust tail pipes, the passenger side had more exhaust pressure than the driver's side. Not a significant difference, but it was noticeable. Any thoughts?

 

Have you ever looked underneath the car?

 

Unless there is a hole in the exhaust its nothing to worry about. The stock muffler exits to the two pipes. The gasses usually do come out of 1 pipe more than the other. See from this pic, both pipes are connected to this huge piece.

 

I can see from the pic that one side of the muffler shows more heat tarnishing than the other. Thanks.