Does anybody know where you can buy this muffler online, and maybe a part number? I know you can get it at a Big Rig shop, but I just don't have any around me. Any help would be greatly appreciated. After reading so much about it, it seems like the only way to go, if you want a quiet free flowing exhaust. Thanks!

 

Ryder Fleet Products www.ryderfleetproducts.com . I ordered Part #W26 M090535. The muffler is 51" long / 9" diameter with 5 inch inlet and outlet and is a true straight through muffler. If you have a 4 inch exhaust you could use 5 inch to 4 inch reducers on each end of the muffler. They also have other mufflers that are 4 inch inlet and outlet. I picked this muffler because it has the best flow rate of any of the other Donaldson's mufflers, and I'm installing a 5 inch exhaust. I hope to have everything installed next week. -Glen

 

Can be bought at any Freightliner dealer. Very reasonable.

 

if i remember correctly- i paid around 60.00 for mine.

 

Thanks man. Do they have a 51' thats 4 inch diameter, or are all 51' Donaldson mufflers a 5 inch inlet and outlet. Is this part number the standard one that pretty much everybody, orders?

 

Yeah they have Donaldson mufflers with 4 inch inlet/outlet.
Also go to the Donaldson website. They give muffler sizes inlet/outlet sizes, flow rates. Find a muffler that works for you then order that part number. Here's the link:
https://dynamic.donaldson.com/webc/W...?section=10194

 

W26 M090544 is the Donaldson with 4" in and 4" out, 51". It does have the crimped baffle in it. Do a search and you will see pictures of the crimp. I just put this one on my 03, minus the baffle. Nice and quiet at cruise, deep diesel sound when you accelerate.