1nicecorvette

should my mufflers (magnaflows) have drain holes for the water? my old ones did these dont, wont they rust from inside easier?

wolfsdad

Never seen a muffler with a drain hole before.... I say no!

dennis

I've seen them with and without. The problem is mostly with the right side muffler retaining moisture longer than the left. Replaced 2 to 1. Finally took the heat riser out to save the right muffler from premature rustout.

Of course you solve one problem and create another. Now takes much longer to heat the choke coil. Blocking my heat crossover isn't helping either

doctorgene

Yes Sir: I thought Magnaflows were Stainless Steel. Corvette Central gives life time Warranty on their Exhaust sets, don't they, if your the org. buyer??? I bought mine from them just because of that. Have a great one. Gene

Z-man

If they aren't stainless and you don't have a written lifetime warranty that includes rust, I'd drill them at the low point.

73jst4fun

Years ago we drilled a hole around 1/8" in the low spot just to let the moisture drip out so it wouldn't sit......did that with the exhaust pipes as well......

Paul L

You are not really dealing with water. Combustion produces a pretty toxic brew, particularly from sulphur in the gasoline. Thus what is sitting in the low end of the mufflers can be sulphuric acid, a pretty corrosive compound. I do have holes in my mufflers whether from the factory or from my 1/8" drill bit. And fluid does drain from them. There is no noise generated (poot-poot).

doctorgene

If it works for them, it should work for you. Stainless is getting cheaper all the time. Have a great Cruise this weekend. Gene

2VettesMike

The factory LT1 mufflers on my 93 came with holes drilled in them and it seems to work in letting out water without making any strange sounds. A C3 small block probably wouldn't know the difference.

Thanks,
Mike