Jeff-
The hole is for draining condensation. You would be amazed at the
amount of water put out by an engine/exhaust when it is warming up. A
hole that small is not considered to be a leak by the Feds.
I make it a practice to drill a tiny hole in any muffler I install.
I have the Gibson system and I had to drill a hole in the back side
of the muffler to drain out the water. Without it, I would hear a
gurgling sound out of the tail pipe when I was idling. I do a lot of
short trips with this truck, so the exhaust sometimes does not get
that hot. I could just picture the muffler rotting out from the
inside.
Rob Weingart
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