Today, while installing my 2WD U-Bolts, I noticed at the rear of my muffler there is a hole in it. The hole is maybe 1/8" in diameter and centered at the bottom of the muffler. It has a good sized amount of black smoke (exhaust) around it. I presume this is for water/condensation to come out since it is a byproduct of combustion but I just thought it was a bit different. Oh well.....

 

seep hole so the muffler doesn't rust out

 

its normal

 

Yep! My Corsa has the same deal. Never paid attention to the stocker.