Having difficulty locating someone in my area that knows anything about Donaldson mufflers. I'm curious as to what muffler (model? #?) is right for my truck..and where to buy it...?
I live in Boise, Idaho...

 

pquestad,
See if you can look up a retail store at this site:

http://www.donaldson.com/en/exhaust/...buy/index.html

If you poke around on this site you can figure out what muffler you want. I believe the part number is M090544 for the 51" muffler. There are others that will work, but this is the most popular.

Do you have a CarQuest near you? They just started carrying Donaldson parts.
They could order a muffler for you.