'54-'56 single exhaust applications used P/N 564915. My '55 has an incorrect muffler and it's banged up from a previous someone bottoming out. I know Waldron's exhaust probably has one. I don't have to be 100% NOS ( https://oldsobsolete.com/products-pa...ler-gm-564195/ ), but curious what the dimensions are? This one for a '55 Chevy sure looks awfully close if not the same. https://www.partsgeek.com/xl3dc1x-ch...r-muffler.html
My car is not concours so I wouldn't mind putting in a Walker aftermarket one. $60 beats whatever Waldron's is going to want.

The Walker muffler:

 

Since you aren't doing a concours restoration have you taken your car to the local exhaust shop?

 

No, the custom exhaust shops here are mediocre at best. I need to have a muffler in hand when I go.

 

Oldsobsolete is showing the shipping dimensions as 32 × 8 × 5 in and mufflers are usually pretty tight in the box where they are sold.
Is the one missing from your car?

 

yeah a 24" long cylindrical shape, its wrong for sure and has a big scrape/dent.

 

I bought the Walker its 27" long and mine has a 24" body, i'll make it work. Better when the exhaust shop doesnt have to add pipe.
$70 bucks to my door, can't complain there.

 

The concourse thing probably won't matter, sound is probably the most important thing to you, and everyone likes something different, few judges look under your car to criticize or take points away. Last time I took my car to a concourse and received a third place, no one even noticed that my car had dual mufflers,(55 didn't come with dual mufflers), no points deducted...Tedd

 

Well those judges were slackin'! LOL thank you

 

"Those judges" were probably Ford and Chevy guys .
With very little knowledge of Oldsmobiles.

 

Yes they were, often happens when judges are generic...Tedd

 

So that Walker for a '55 Chevy is a direct fit, zero issues at the exhaust shop. Sorry for the crappy pics, didn't get any while it was up in the air.

 

Nice. How did it sound?

 

It's a quiet-flow, sounds real good. I'll try to post a video.