My 03 V-6 Mustang muffler has a small 1/8” diameter hole in it at the back side on the bottom of the end cap. It looks to be a stamped hole from the factory. No rust, etc. It looks to be for letting condensate out of the muffler. Is this how they are made? This is the first time I have ever seen anything like this. I noticed this about a year ago and thought it was a rusted out muffler. I got under the car today, thinking I would find the muffler rusted out. Any ideas?