51” Donaldson, remove baffle?
09-17-2007, 07:36 PM
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51” Donaldson, remove baffle?
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?
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?
09-17-2007, 07:55 PM
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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
09-18-2007, 07:10 AM
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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.
09-18-2007, 10:03 AM
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What kind of pyro numbers did you start seeing after the install? (how much higher then before?)
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09-18-2007, 10:17 AM
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09-18-2007, 01:15 PM
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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.
09-18-2007, 04:22 PM
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09-18-2007, 05:19 PM
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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).
09-18-2007, 06:29 PM
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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.
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.
09-18-2007, 08:50 PM
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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....
EGTs are all good, even when towing pretty heavy....
09-18-2007, 09:44 PM
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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