Aero Muffler

[Lin]

I started this as a new thread so the original muffler mod thread would not get completely sidetracked.

The Aero looks to be a nice improvement.  My 8v71 muffler has a 5" inlet, which I assume to be standard, and a 4" outlet, which doesn't matter.  The only problem I see is that the current muffler has both inlet and outlet on the same (rear) end, so this would require changing the location of the exhaust discharge, Which would put it around the back of the rear tires.  It looks to be within the skill set of a good muffler shop.

Is there any downside to making the switch?  I guess Scott, for one, would know since he has done it.  Anyone else?

[Lin]

Just wanted to add something else.  The muffler/welding shop I sometimes use recommended buying a similar product, Magnaflow 12774.  The specs on both are almost exactly the same.  He claims that he has seen Aeros develop cracks.  Anyone have any experience with Magnaflow?

[Bill Gerrie]

I use a Magnaflow 14774 muffler. 5" in 5" out straight through. It is about 30" long and 8" dia. It is loud on a 2 stroke but no back pressure. It is silent on a 4 stroke Cummins.

[Lin]

It looks like the difference between the 12774 and the 14774 is that the former is satin finish and the latter is polished. 

[Utahclaimjumper]

I have had my Aero stainless for 10 years now and no problems,, it's still polished as new.. I have never heard the cracking statement,, I think he wants a sale.>>>Dan

[DoubleEagle]

Seangie put the Aero Muffler on his Eagle back in May, 2016, and he had good luck with it.

[Lin]

Okay, for all of the muffler comparison fans I wanted to report my research results.

The Areo AT5050XL is made of 304 grade stainless while the Magnaflow 12774 is made of 409 grade stainless, which has a lower chromium content. The Magnaflow 14774, as Bill G. has, is made of a grade of stainless that is somewhere in between the two.  Further, the Maganflow unit is a straight thru muffler and can be mounted in either direction.  The Aero unit is not straight thru and has a dedicated inlet and outlet. They claim that their design evacuates exhaust faster than a straight thru pipe. The Areo also has a built in resonator, which is supposed to modulate the droning a bit.

I ordered the Aero through my muffler shop.  It really makes no difference to him which I want.  His price for either is the same as online. He makes his money off the installation, which will be in the range of $125. I am mainly interested in anything that will lower the engine temps.  Of course, any extra power or fuel mileage would be nice too.

[Utahclaimjumper]

Lin,, study the entire exhaust system and determine is some other changes can be made to reduce restrictions in the system.. I was able to remove two 90 degree elbows by redirecting the flow and then added the aero resonator and got a substantial improvement of my Cummins 8.3..>>>Dan

[Jim Eh.]

BTW, who has slid under their bus lately to look at, let alone polish, their SS muffler?
Just sayin'

[Lin]

Jim: Agreed that I do not really care about the appearance of the muffler. It may be debatable whether more chromium is better or not.  Aside from appearance, more chromium adds more rust-free life though.  I'm not sure if it is more brittle and don't know if that makes any difference.

Utah: The exhaust pipe drops right out of the engine with one el to the muffler, so there is nothing to do there.  I do not really think there is any abnormal restriction, but if increasing exhaust evacuation reduces some heat, it seems worth it to me.

[Utahclaimjumper]

To clarify,, I remove two 90 els and replaced that angle with one 45 el to counter the problem you have,,every little bit helps..  Also I heat wrapped from the turbo to the muffler to increase flow and reduce heating the bedroom.>>>Dan

[Jim Eh.]

Heat sleeves are a little more convenient and waaaay easier than wrapping.
http://shop.grpipes.com/templates/product.aspx?ProductGuid=HS-24&GroupGuid=33

[Utahclaimjumper]

After 33 years as an aviation mechanic/inspector,,I have wrapped quite a number of exhaust systems and prefer it.>>>Dan

[Jim Eh.]

It does work but I just never got the hang of it nor a fancy to the music  .

[Ed Hackenbruch]

Lin, when i got my bus the inlet and outlet were both on the same end and my exhaust pipe came out under the back corner of the bumper. Couldn't see it in the mirror.  Looked like it could get ripped off if i went thru a deep enough dip.  When i had to get a new muffler i got a Donaldson with inlet on one end and outlet on the other. put a 90 on it and had it come out right behind the tire. Liked it because then i could see what color smoke, if any. was coming out.  Because the body angles down toward the tire a little from the bumper, i flattened the end of the 90 just a little to give more clearance.