Originally Posted By topside
I would expect a wrap to help with high-frequency sound - like "ringing" - but not the lower-frequency "booming" or droning;


This, but then in the OP's case, there is likely little HF emitting thru the muffler case or tubing in the first place.

And the wrap "trapping water" is a non issue, unless one drives thru standing water when cold, and then immediately parks the car. The wrap basically overheats steel tubing, causes it to oxidize at the newly elevated temps, and also cyclically heat fatigues the metal, until it crumbles.

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.