51” Donaldson, remove baffle? - Dodge Diesel

mitternocht · 09-17-2007, 07:36 PM

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?

BigTXDually · 09-17-2007, 07:55 PM

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

Bikinaz · 09-17-2007, 08:48 PM

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

PEAKSTRYDE · 09-17-2007, 09:42 PM

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

mitternocht · 09-18-2007, 05:47 AM

PN: m090544

paroxysym · 09-18-2007, 07:10 AM

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.

ropnjessi · 09-18-2007, 10:03 AM

Quote:

Originally Posted by BigTXDually

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

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

rip 112 · 09-18-2007, 10:17 AM

Quote:

Originally Posted by paroxysym

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.

Not with a muffler, but my stacks howl alot.

paroxysym · 09-18-2007, 01:15 PM

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.

BigTXDually · 09-18-2007, 04:22 PM

Quote:

Originally Posted by ropnjessi

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

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

Mark Hodowanec · 09-18-2007, 05:19 PM

Quote:

Originally Posted by BigTXDually

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

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).

mitternocht · 09-18-2007, 06:29 PM

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.

RedRacer44 · 09-18-2007, 08:50 PM

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....

stealman1 · 09-18-2007, 09:22 PM

Does the Donaldson 51 offer any gains from stock?

colorado bill · 09-18-2007, 09:44 PM

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

09-17-2007, 08:48 PM	#3
Bikinaz Registered User Join Date: Jul 2003 Location: Phoenix, AZ Posts: 314 My Photo Gallery My Classified Ads	I punched mine out. I don't think you'll need it. __________________ 03 2500 4x4 QC SB HO AT 3.73 BD Xmonitor Edge EZ 2" leveling kit with Bilsteins H2's with 315/70/17 BFG AT Inyati Spray in Liner “Homemade” cold air intake Husky floor mats Road Armor Bumper 4" turbo to tip with Donaldson 51" Defiant Steering Box Support Stabilzer LazarSmith Track Bar Bushings LazarSmith Ultimate Track Bar Hardware Carli Sway Bar End Links Dealer warranty rebuilt 48RE with converter 4 new ball joints :-( Optima Blue Top Batteries

09-17-2007, 09:42 PM	#4
PEAKSTRYDE Registered User Join Date: Oct 2005 Location: Minnesota Posts: 680 My Photo Gallery My Classified Ads	What is the part # of the muffler you guys have???????????????? __________________ 04.5 2500 CTD, NV5600, QC, LB, 4x4, 4.10's, Single Stack mounted w/The STAXX CLAMP MNDTR #43 MEMBER #2 STAXX Clamp INSTALLATION (Link removed site violation) H2 Wheel Detailed MOD instructions[/URL]

09-18-2007, 07:10 AM	#6
paroxysym Registered User Join Date: Aug 2006 Location: baltimore, md. Posts: 1,158 My Photo Gallery My Classified Ads	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. __________________ '05 Dodge 2500 CTD SLT Atlantic Blue, QC, SB, 4.10's, Off-Road Package, 48re Mods: S&B, ISSPRO, FASS, Lorenz, Bilstein, Goerend, BD, PIAA, Procomp, Line-X, Quad Mods to be installed: sway-bar links, bilstein stabilizer 450hp/845tq SOLD

09-18-2007, 08:50 PM	#13
RedRacer44 Registered User Join Date: Jan 2007 Location: Mannford, Oklahoma Posts: 438 My Photo Gallery My Classified Ads	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.... __________________ Chance 2004.5 Ram 2500 CTD 4X4 Auto - Smarty REVO, S&B Intake w/ Amsoil Dry Filter, Silencer Ring MIA, 5" Turbo-Back Exhaust, Autometer Phantom II Pyro/Boost/Trans gauges, Leveled, GearAlloy 18s wrapped in 325 Nittos... 100,000 miles...and counting... SAC #115 The Cummins only comes in one flavor: Hardcore. And there is no mistaking the sound, road presense, and tarmac-twisting torque of this beast. Its brashly American. It's why the French hate us!

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09-17-2007, 07:55 PM	#2
BigTXDually Registered User Join Date: Mar 2006 Location: College Station,TX Posts: 275 My Photo Gallery My Classified Ads	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, 05:47 AM	#5
mitternocht Registered User Join Date: Sep 2006 Posts: 551 My Photo Gallery My Classified Ads	PN: m090544

09-18-2007, 01:15 PM	#9
paroxysym Registered User Join Date: Aug 2006 Location: baltimore, md. Posts: 1,158 My Photo Gallery My Classified Ads	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, 06:29 PM	#12
mitternocht Registered User Join Date: Sep 2006 Posts: 551 My Photo Gallery My Classified Ads	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.

09-18-2007, 09:22 PM	#14
stealman1 Registered User Join Date: Oct 2006 Posts: 245 My Photo Gallery My Classified Ads	Does the Donaldson 51 offer any gains from stock?

09-18-2007, 09:44 PM	#15
colorado bill Registered User Join Date: Mar 2007 Location: colorado Posts: 24 My Photo Gallery My Classified Ads	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