Drilling Holes In Mufflers
Guys used to do this, in fact I believe that some mufflers even came.with a drain hole. The idea is if the car only ever makes short trips it never has a chance to burn off moisture (water is a combustion by product) out of the mufflers, where it accumulates and rusts the muffler out prematurely. This doesn't seem.to.be as much of an isssue nowadays......better steel being used? At any rate all you need is an 1/8 hole at the low point of the muffler. An exhaust leak......technically yes, but so minimal you would not hear or notice it.