Muffler Magic

fastRob · **Posted:** Mon Mar 10, 2008 5:01 pm

In order to be a good newbie I used the search for a couple of hours to find the Magnaflow part number for the muffler.
No luck.
I went to the magnaflow web site and the online venders sites but got confused and bewildered.
Is this muffler: 2.5," inlet centered, outlet offset, 22" body, 28" overall? Not part number 12226.
Are stainless flanges available to match up the cat flange to the new muffler?
The 2.5"-3" reduction seems strange. Would a 3" make sense? Is that where the Magnaflow 15870 number comes in?

Purchased it Saturday, ordered fumoto valve, made appointment for ball joints with other recall items, fuel filter, oil change and skid plate installation(if fumoto valve comes in)

R

Pote · **Posted:** Mon Mar 10, 2008 6:06 pm

you need 2.5" in and out. center and offset. note that your stock setup necks down to 2.25" just before the muffler, just have them lop that off on the install and marry the 2.5" part to the 2.5" on the muffler and good to go. sorry I dont have the magna part number.

Threeweight · **Joined:** Mon May 14, 2007 5:57 pm **Posts:** 679

Other option worth considering is a Flowmaster model 40 or 50 (50 is a little quieter). They are all welded with internal baffle chambers vs. perforated tube with muffling packing around it (nothing to soot up or burn out over time). I like mine.

fastRob · **Posted:** Mon Mar 10, 2008 9:39 pm

One great idea from this forum's resident experts is to do a 3" cat back.
We have to tow and that would help the exhaust flow.
Use a short flow through 3" Magnaflow muffler, 3" mandrel bent tubing maybe with a little extension on the end of the exhaust tip to help pass the gas.
Would the cat flange be best cut off and a 3" tube welded in or should the older, smaller flange be reused or a new larger 3" piece of flange material be welded in? I think a 3" flange to be able to unbolt the sections for repair of the cat.
Stainless or steel?

R

Turbo Tim · **Posted:** Tue Mar 11, 2008 9:16 am

Ok, I did it yesterday. I took off both the cat and the factory muffler.
I then welded in "New" exhaust flanges so everything can be put back on to "Factory" specs.

I then put on the Flowmaster 2 1/2 in (center) / 2 1/2 out (offset) 70 series, PN: 52572 muffler and NO cat.
The 70 series is supposed to be one of the quieter ones.
That was worth doing. There is no difference in the sound inside the Jeep, and just a hint of an exhaust note behind the CRD. Driving is noticeable different. Better off idle response, "Seems" to be better acceleration, but doing an 75 MPH punch is very noticeable. Much better.
I recommend it......

dgeist · **Posted:** Tue Mar 11, 2008 9:25 am

So, the muffler is obvious and the Cat is the next thing upstream from the muffler. What exactly is the little thing just upstream of the cat (right after the pipe goes horizontal) that looks like it has steel mesh wrapped around it? I'd love to know what the legalities of removing the CAT are as well. I'm sure it's a state thing, but where does one look within the state to determine if that can be done without legal recourse?

honey_don't · **Posted:** Tue Mar 11, 2008 9:32 am

dgeist wrote:

So, the muffler is obvious and the Cat is the next thing upstream from the muffler. What exactly is the little thing just upstream of the cat (right after the pipe goes horizontal) that looks like it has steel mesh wrapped around it? I'd love to know what the legalities of removing the CAT are as well. I'm sure it's a state thing, but where does one look within the state to determine if that can be done without legal recourse?

That mesh thing is a flex joint, keeps the vibrating diesel from cracking/damaging the exhaust. Common on diesel exhausts. Check your state DMV website for regs. Examples: here in FL there are no checks, Some northern VA counties have OBDII readiness/CEL checks but no exhaust checks so there you could have no cat as long as no CEL...

fastRob · **Posted:** Tue Mar 11, 2008 9:52 am

I believe the mesh thing is for vibration cancellation.
The cat is like a lot of things today; government mandated, divorced from reality.
We here do not practice pissing into the wind.

This mini-mod is cat back 3"stainless Magnaflow 18" center/offset part #12259 for $105 including tax and shipping.
Meineke muffler has a 10' stick of 3" stainless tubing and the guy says he can make sweet bends and do the flanges.
I want the flange post cat to be able to mod upstream if needed or for ease of repair.
If I could only figure out what that wise gentleman used that 3/4" steel rod for on this mini mod it could be completed.

My camera is sitting beside me to be shipped out for repair, and I do not photograph well, babe magnet and all, so no pretty pics.

R

gmctd · **Posted:** Tue Mar 11, 2008 11:47 am

Those other engines require a catalyst that reacts with their combustion byproducts to meet EPA regulations for exhaust emissions - thus they have a catalyzing reactor which emits sulphuric and other acids, caustic to objects and oxygen-breathing creatures alike - no problem.

Diesel exhaust, with no byproduct to catalyze, suffers no such ignominies, having, rather, an oxidizing reactor, similar in appearance to the catalyzing reactor, but no catalyst in the ceramic matrices - in that instance the heavier component of Diesel exhaust, soot, is trapped within the matrices, such that a 70mph run for ~15mins will raise the temperature of the reactor to a level which easily oxidizes the particles, rendering ash, which blows out the tailpipe for oxygen respirating creatures to inhale - ash, of course, is a known cancer carcinogen - no problem.

(FYI - cancer, war, and street-gangs are big-government acceptable methods of population control and economy stabilizers - think about it)

Now, as the high temperatures available in exhaust heat plays a big part in the role of both reactor types, they are most unsuited for most off-road use, and have been known to start brush and grass fires - therefore, if one chose to pursue off-road activities, it would be advisable to eliminate that source of heat intensification in order to further protect the local ecology - one such method is to use a suitable tool to open up the reactor matrices, preventing any intensification of exhaust temperature, such that the reactor shell is never any hotter than the exhaust pipe or muffler - the empty reactor shell can still muster required visual inspection by local smog cops, where mandated.

The procedure also removes the intense restriction in the exhaust path, freeing up exhaust flow for more efficient engine function

A well-applied BFH on a short section of 1/2" pipe is most suited for modifying the ceramic matrix for off-road use only - a piece of 3/4" crs rod, or even rebar, comes in a close second.

yrmvc.............

Turbo Tim · **Posted:** Tue Mar 11, 2008 5:03 pm

Wow, Yeeee Hawww. Much better without the cat and stock muffler. Off the line is much better, but that 75 MPH punch is great!!!

Of course I'm just "Testing" this without the cat right now. I am looking for another reactor unit that can be mounted over the exhaust pipe just before my Flowmaster muffler only with higher flow properties. This way the “Visual” will appear proper.

The little thingy with the cross-braid over it is a flex joint, and I might add that it is very flexible. Flexible enough that with the cross member removed it will hang down enough that you can weld your new flange on with no problems.

My testing is showing me that there is something to be gained in performance but still waiting to get through a couple of tanks to see what my new mileage is going to be…

DarbyWalters · **Posted:** Tue Mar 11, 2008 5:30 pm

I am waiting to hear the mpg results...keep the foot off the Go Pedal a bit...huh?

You know with the EHM and SEGR, we don't really have that much PM/Soot to turn to ash :lol:

honey_don't · **Posted:** Tue Mar 11, 2008 5:32 pm

check out the magnaflow diesel cats, I think they make a 3" too:
http://tdiparts.com/catalog/product_inf ... cts_id=870

Only thing I could find on the magnaflow site was 3.5" and bigger...

Coal Cracker · **Posted:** Tue Mar 11, 2008 5:36 pm

Turbo Tim wrote:

Wow, Yeeee Hawww. Much better without the cat and stock muffler. Off the line is much better, but that 75 MPH punch is great!!!

Of course I'm just "Testing" this without the cat right now. I am looking for another reactor unit that can be mounted over the exhaust pipe just before my Flowmaster muffler only with higher flow properties. This way the “Visual” will appear proper.

The little thingy with the cross-braid over it is a flex joint, and I might add that it is very flexible. Flexible enough that with the cross member removed it will hang down enough that you can weld your new flange on with no problems.

My testing is showing me that there is something to be gained in performance but still waiting to get through a couple of tanks to see what my new mileage is going to be…

Tim,

does the 70 series droan like most of the other flowmasters do/

i want to put somthing better on that this stock restrictor thing they call a muffler.

My wife and I drive it, so i want to make it headache free, lol my Cummins has the muffler delete option :lol:

Turbo Tim · **Posted:** Tue Mar 11, 2008 7:24 pm

Right now with the Flowmaster and no cat, INSIDE there is no change. Just the same old purr of the engine. NO Drone!
With the window(s) open, sometimes in close traffic you might hear a "Note" from the engine, but it is very low in volume level.
Outside standing behind the CRD, you can barley pick out the exhaust note, but it is there. Before with stock setup, no sound at all.

Overall, I'm keeping it just the way it is. It is acceptable to me.
Mind you that I did NOT want a drone sound inside, and with the series 70 Flowmaster, that didn't happen.

I'm a happy camper.
(Also realize that I made my own exhaust mounts/plates so I can put it all back to stock in about 5 minutes).

BlackLibertyCRD · **Posted:** Tue Mar 11, 2008 9:34 pm

I have the V-Force that is a flowmaster 40 clone and during normal driving just like stock sound. When I punch and wind the turbo out, I hear a whoosh noise like a high pressure air hose coming from the rear out the tail pipe.

fastRob · **Posted:** Tue Mar 11, 2008 9:51 pm

dgeist wrote:

................................................... I'd love to know what the legalities of removing the CAT are as well. I'm sure it's a state thing, but where does one look within the state to determine if that can be done without legal recourse?

Think federal and state regulations. Your registering state regs are easily found by visiting a local reputable inspection station. Feds live in castles in the sky.
Consider how government can enforce any reg., usually by inspection sticker, registration and random check.
Government could (has) evolve(d) into a cancerous growth that (has taken) takes on a life of it's own with a strong instinct for survival. Order must be maintained at all costs. Sound familiar?
Appearances are everything. A hollow shell describes government and a useless catalytic converter, but it looks good.
If it was there stock it does not matter to a diesel engine hollow or full except for the drag on the flow of exhaust gasses.
Remember; it is all on the level, looks don't count.

R

fastRob · **Posted:** Thu Mar 13, 2008 9:57 pm

There are still some easily removable restrictions.
But the installation has a certain appealing rumble and whine.
Maybe I just want it to go faster, clatter louder.

Muff $105 after tax.
3" stainless tubing and installation $240, not a sanitary fit but adequate, big pipe sticking out.

R

Turbo Tim · **Posted:** Wed Mar 19, 2008 12:20 am

Ok, after two tanks of fuel, the mileage is: 1st tank, about 2 more MPG (24.5), and the second tank: 0. (23). Do you suppose that if I didn’t drive it like I just stole it if that would make a difference?
So with my fake cat (hollowed out) and 2 ½ Flowmaster on, it runs much better so I’m leaving it alone.

One thing I can’t understand is why some would want to put a 3 inch cat-back system on when the hole size coming out of the turbo is only 2 ¼ inches, stepping up to 2 ½ . With the restriction of the cat, the stock 2 ½ is more than enough flow.

Anyway, I recommend it. The 75 MPH punch is definitely better..

fastRob · **Posted:** Wed Mar 19, 2008 12:55 am

Turbo Tim wrote:

Ok, after two tanks of fuel, the mileage is: 1st tank, about 2 more MPG (24.5), and the second tank: 0. (23). Do you suppose that if I didn’t drive it like I just stole it if that would make a difference?
So with my fake cat (hollowed out) and 2 ½ Flowmaster on, it runs much better so I’m leaving it alone.

One thing I can’t understand is why some would want to put a 3 inch cat-back system on when the hole size coming out of the turbo is only 2 ¼ inches, stepping up to 2 ½ . With the restriction of the cat, the stock 2 ½ is more than enough flow.

Anyway, I recommend it. The 75 MPH punch is definitely better..

Turbo T,
Glad to hear about your better mileage.
No improvement noted in mileage on this one yet. More noise, seems like more power and I admit getting into it more, the turbo boost is a buzz.
I could have gone to the Cat with the 3" but went to the flange instead as my Cat is not hollowed out and with the flange in place...... although I have a huge aversion to violating laws that could cost me big time even if I know they are Bull. Thinking about going with a 3" cat and 3" all the way to the manifold where it is I believe 3." The exhaust system guy said there were strange fittings that I would have to locate myself.
I have an Airstream, want to tow it to the southwest and tend to eliminate variables one at a time as I go. The huge muff was #1.
And if my illogic is not enough, how about this; My 3" pipe hanging down is bigger than yours :lol:

R

Tinman · **Joined:** Mon Apr 10, 2006 10:45 am **Posts:** 308

Any comments on the Aeroturbine 2525 muffler. I was thinking of one of those.

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