OK, guys.... just got my 51” Donaldson to replace my strait pipe. The strait pipe is just getting old. It sounds good a low RPM’s in town, but is annoying going down the highway and in the woods.

Should I remove the baffle in this thing or put it on as it is? Any one ran it either way or both?

 

At first i left mine in but a few looks at the pyro and I took it out. Yeah its got hole in it to let stuff pass but mine got glogged with soot and started to cause problems

 

I punched mine out. I don't think you'll need it.

 

What is the part # of the muffler you guys have????????????????

 

PN: m090544

 

anyone notice if knocking the baffle out caused like a howling sound at higher speeds? i noticed around like 75+ it makes a howling sound. i knocked the baffle open alittle. but i didnt open it all the way open, i might.... or just switching back to my other muffler.

 

What kind of pyro numbers did you start seeing after the install? (how much higher then before?)

 

Not with a muffler, but my stacks howl alot.

 

i dont get it- my previous free flowing, no baffle, you could see straight through it muffler i had before from hog performance didnt howl or anything. it was just obnoxious. the donaldson causes like a howling sound when cruising or accelerating now its weird. probably going back to the hog performance piece, so a donaldson is up for sale LOL. 3 weeks old.

 

they numbers went up around 250-400 from having my MBRP

 

The Donaldson is so restrictive that it clogs up? I never heard of any muffler doing that. How does it compare to a strait pipe (mine is an 4.5 & I still have the kitty).

 

Well, I knocked the baffle open. The inner baffle is a perforated 4" pipe that has the end crimped shut so the flow has to go through the perforations.

It took a little effort, but I was able to open the crimp up to about 80% of the 4” dia pipe area making somewhat of a venturi. I can see how the perforations could clog with soot.

I’m still waiting got a pipe cutter to come in, but I hope to have it on within a week to see how it sounds.

 

I just threw on my Donaldson with the baffle still in....didnt noticed any changes in EGTs really versus from when I had my Aero 4040 muffler on.

EGTs are all good, even when towing pretty heavy....

 

Does the Donaldson 51 offer any gains from stock?

 

I had a 30 inch magna-flow and it was to loud when pulling my trailer,put on the Donaldson and the sound level is good maybe a little quite but no way would I put it back on,but as for as performance it seems like it lost a little of the throw you back in the seat feel,exhaust temps did not change