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Topic: Diesel Performance Muffler

Posted By: Craigtaz on 02/13/12 02:52pm

I'm considering a muffler upgrade for my RV's Cat C7 engine. I've found two different mufflers on the internet, The Aero 5050XL, and the Magnaflow 12774. I'd like an increase in performance along with lower EGT's, but not at the expense of an overly loud exhuast.

I'd like to hear the pros & cons from any owners that have done this mod.

Thanks!

Craig


Posted By: Dog Trainer on 02/13/12 03:50pm

Remember a Turbo Diesel is a much different animal than a gas motor. You do not have the back pressure requirement of the gas motor. You can basicly straight pipe a Diesel and get better flow but you will also increase the noise. I would be very careful of the Exhaust hype unless there is also a change in the headers. These things are big air compressors so more air in and more air out is generally a good thing. I am straight piped and the noise is not bad at all. My motor is a B 5.9 and yours may be bigger and less tolerable straight piped.


93 Airstream 35' Dp
5.9 230 uprated to 300 HP
Allison MD 3060
Shadow 12 yr old Golden Daktari & Lydia Cavalier King Charles (fur Bearing Children) Duchess my Golden daddys little girl at the Rainbow bridge since 4/12



Posted By: badboy368 on 02/13/12 06:53pm

I too would very interested to know for my m/h


40' pusher,350 turbo cat, pullin a 37' trailer haulin a drag car. oh yea baby



Posted By: sjholt on 02/13/12 04:26pm

I'd go with the Aero 5" resonator. Cost cheaper than the Magnaflo and flows great and less noise than the Magnaflo. I have a 4" magnaflo and it does get loud climbing hills.


Skip
1996 32' Monaco Windsor DP
Cummins 5.9L 230+ HP
5 Airbags in front- 4 in back


Posted By: randallb on 02/13/12 04:49pm

Try Spin Tech. Their mufflers have been the only ones tested that had no effect on the power curve of a sprint car engine. These dyno tests were run by one of the best SC engine builders around. Their design almost eliminates exhaust resonance. Yes they do produce diesel mufflers and at a reasonable cost.
Randy


Posted By: Livin Good on 02/13/12 07:36pm

That's all we need, a bad rap on "Loud RV's". I guess you can throw in a "low-rider kit" and really be the talk of the town....

Not for me.


Posted By: Craig P. on 02/14/12 09:37am

jauguston wrote:

One thing is for sure if you like noise the Aero is for you.

Jim,

Wouldn't a loud exhaust compliment your loud paint job?

Just kidding!

Craig


My wife does all the driving - I just hold the steering wheel...

2005 Providence 39J
2007 Tacoma PreRunner Double Cab Dingy
Thousand Trails & Coast to Coast Members



Posted By: loydt on 02/14/12 07:31am

Mike,

Im betting the rear of your coach is configured the same as mine probably. That might be the exact same muffler I could use.


2006 Monaco Camelot 40PDQ, Cummins 400 ISL, 2012 Itasca Ellipse 42QD, Cummins 450


Posted By: FIRE UP on 02/14/12 12:14pm

Craigtaz,
I just had the Aero 5050XL installed by Brazels RV in the Quartzsite RV event held about 3 weeks ago. Now, I put off the purchase of this particular muffler due to the same reasons you're looking at. Does it increase torque, HP, mileage, anything? Well, a friend of mine who was camped with me there in Quartzsite, was also putting it off.

We both decided to do it while there. Well, he went one way and I went the other. He purchased it and, all the components needed for the installation. His cost: $ 635.00 out the door and, he has to install it. I went with Brazels and my cost: $650.00 out the door INSTALLED! Now, it's louder for sure. But, surely tolerable. After all, it's 37' away from our ears and, the exhaust tip is out the rear of the coach and points to the passenger side.

So, yes we do hear it, but primarily on take off from stop lights and it's emphasized by resonating off other vehicles and store fronts etc. If, we're out in the open, it's almost not noticeable at all.

Now, did I get tire burning capability after the install? Nope. Did I get phenomenal horse power increase at any level, nope. Did I get a fantastic increase in gas mileage, are you kidding? These rigs are 30,000 lbs or more. Nothing increases the gas mileage, don't kid yourself. I don't care who tells you what these aftermarket mufflers will get you, you simply take your expectations and table them until YOU have it installed or, install it yourself. And, you MUST know your motor home and its operational characteristics for any given situation and know how it accelerates, cruises, rpms, amount of throttle needed for a given hill, grade, load and more, AND KNOW IT WELL, to determine IF, the new muffler will do you what you think it was supposed to.

I'll get flack here but, the truth is, lots of aftermarket items "CLAIM" this and that, but, in all honesty, truthfully, much of it never happens. I'm certainly no hot rodder. I'm quite conservative in driving this beast. I hold it at 60-62 while out on the open road. It's an '04 Itasca Horizon, 36GD with the 330 C-7 CAT and the Allison MH 3000 trans.

I had it installed because we had a 200 mile trip from Quartzsite back to San Diego for a "Test" run on the new muffler. I certainly would and could have installed it myself but, I got lazy.

What exactly did I get from the install? I maybe got a bit of bottom end increase in "grunt" from the take-off stand point. I might not have to hold as much throttle on a given grade. My gas mileage, is the exact same. It's around 7-8 anyway so, it is what it is. But, as one of the answers suggested, if you go over to irv2 and check out the CAT C-7 forum, you'll find more info on this particular muffler. Of all the statements made on that forum, AFTER the install, not one of them had a mileage increase.
Scott


Scott and Karla
SDFD RETIRED
2004 Itasca Horizon, 36GD Slate Blue 330 CAT
2011 GMC Sierra 1500 Ext Cab 4x4 Toad
2008 Caliente Red LVL II GL 1800 Goldwing
KI60ND



Posted By: jauguston on 02/14/12 09:26am

There is a long thread on iRV2 on this subject in the CAT engine forum. The problem is noone has any verifiable data as to any improvement in performance,EGT or mileage. One thing is for sure if you like noise the Aero is for you.

Jim


2005 Coachman Sportscoach Elite 402 40'
350hp Cat C-7 w/MP-8
7500w Onan quiet diesel generator
6-Kyocera 130w solar panels SB3024i MPPT controller
Pressure Pro TPMS
1987 Suzuki Samurai tintop Toad w/VW 1.6 turbo diesel power



Posted By: F350OilBurner on 02/13/12 08:39pm

.

* This post was last edited 04/15/12 02:12pm by F350OilBurner *


2006 Ford F350 Lariat CC LB DRW
6.0 PSD w/TorqShift 4x4 4.10LSD
Airlift Airbags/SureSet Controller - Timbrens

2007 Lance 1181 - All the Options
Torklift Superhitch/Tiedowns/Fastguns



Posted By: wny_pat on 02/13/12 08:55pm

sjholt wrote:

I'd go with the Aero 5" resonator. Cost cheaper than the Magnaflo and flows great and less noise than the Magnaflo. I have a 4" magnaflo and it does get loud climbing hills.
X-2


“All journeys have secret destinations of which the traveler is unaware.”


Posted By: zmotorsports on 02/14/12 05:58am

I am running a 5" inlet/outlet Dynomax on my Dynasty with the ISL engine. The original owner of our coach had hit something which dented the 90 degree elbow under the engine. While I was under the coach taking measurements for what I would need I noticed how big and bulky the OE muffler was and how bad the heat tracing was. I thought it would be better to let the exhaust breathe a little better so as not to back up too much heat but I didn't want to cool it too much as heat is what spins the turbo.

I checked around and found a Dynomax muffler with 5" inlet/outlet that was a third the size of the OE muffler. It tucks up much neater and tighter under the rear of the coach and fits under the OE heat sheild much nicer as well.

I really like the sound of it. It is not noisy or raspy, just deep and throaty. Driving down the road you cannot tell any difference, however, driving slow through a campground it sounds awesome.

There is a local RV repair shop here that is installing the same one on many of the coaches they work on. They are an Alfa repair center and the gentlemen who owned the shop had the C7 CAT in his Alpha, he is the one who turned me on to it when I was looking for a muffler.

Mike.


2003 Monaco Dynasty/ 26' Haulmark Edge trailer
2011 Jeep Unlimited Rubicon



Posted By: Livin Good on 02/14/12 05:32am

wny_pat wrote:

sjholt wrote:

I'd go with the Aero 5" resonator. Cost cheaper than the Magnaflo and flows great and less noise than the Magnaflo. I have a 4" magnaflo and it does get loud climbing hills.
X-2


Sounds like a boat.


Posted By: Craig P. on 02/15/12 02:59pm

jauguston wrote:

The hard part is getting to the top of the engine on my coach and so I can control it from the drivers seat running the 40' control cable extension from back to front. That was a PITA.

Ain't that the truth!

We sure seem to hit all the same forums, don't we Jim?

I also had an issue with the engine recognizing the programmer. Thanks to another member who had been down that road already, I found that I had to reset my ECM. A quick disconnect of the engine batteries fixed the problem.

Craig


Posted By: J Walker on 02/14/12 07:08pm

I have not installed the Aero muffler on my ISB 260 HP but I considered it before replacing the original muffler with an OEM one. I could not find answers to some questions so I played it safe. One question is how an Aero would affect the exhaust which drives the turbo. It might increase the speed of the exhaust gases and turn the turbo faster. How would it affect the exhaust temperatures in the system. Finally, the noise. An Aero very well might be superior in every way but I can not be sure.


Jim Walker
2014 Thor Palazzo 33.2, 6.7 Cummins, 2100 Allison
2009 Malibu



Posted By: FIRE UP on 02/14/12 07:38pm

J Walker wrote:

I have not installed the Aero muffler on my ISB 260 HP but I considered it before replacing the original muffler with an OEM one. I could not find answers to some questions so I played it safe. One question is how an Aero would affect the exhaust which drives the turbo. It might increase the speed of the exhaust gases and turn the turbo faster. How would it affect the exhaust temperatures in the system. Finally, the noise. An Aero very well might be superior in every way but I can not be sure.


Well Sir,
The company that did the install, as well as other vendors there at Quartzsite at the time, all agreed that since there's vitually no back pressure with the install of the Aero 5050XL, the turbo will "spool up" at a lower RPM rate and therefore, increas torque at a lower rpm too. That will intern, give you more pulling power right off the line. But, like I stated, "Could I tell a whopping" difference? Not really. We've owned the coach for over 10 months now and have been on a few small trips as well as driving it home from our purchase place, Sparks NV to San Diego CA.

As well as I think I know that coach, its engine and performance, I cannot simply say, IT'S AN AMAZING DIFFERENCE! It most likely is better, but just how much, well... the juries still out.
Scott

P.S. Now, what the company tried to sell me was a "Package deal" in that, along with the Aero 5050XL Stainless steel polished muffler, they wanted me to also purchase the "Chip", specially designed for the CAT C-7 and, some sort of special Air cleaner that's supposed to have better air flow. But, I elected to just run with the muffler for now and see what benifits it has/had to offer.

If, at a later date, I think that the "Chip" is warranted, I'll dive in on that one. It's about $500.00 for that one. A bit pricey for me right now.
Scott


Posted By: FIRE UP on 02/15/12 11:13am

jauguston wrote:

Jet A,

In some cases it is not adding extra fuel that gives the increase in horsepower. Most of the newer engines have had their injection time retarded as they have found that is a cheap way to reduce emissions for our government. The programmer I use (MP-8) puts back the injection timing to where it was intended to be by the engine design engineers before the EPA got into the act. Fuel consumption does not increase and there is a "slight" increase in MPG-"slight"-not a lot. EGT is also slightly lower also. You never get something for nothing and the price I pay is my engine will not meet its mandated emissions limit when I turn it up. Sorry but I don't care. There is no required emission testing where I live. I still have the big quiet stock Freightliner 5" muffler.

I wish someone had and would post a stock 5" muffler and 5050XL muffler dyno pull comparison.

Jim


Jim,
The "MP-8" is the chip they wanted me to buy along with the muffler. I was already shelling out $650.00 for a complete install for the muffler. So, to spit out another $500.00 for that chip at the same time was just too much to swallow at that time. I'm recouping from the install right now and like stated, I'll evaluate when it's time to install the chip.
Scott


Posted By: jauguston on 02/15/12 01:45pm

From the research I did before buying the MP-8 it seems to be far and away the most popular programmer for a wide range of applications from diesel pickups to large agricultural tractors. I asked around at several heavy truck dealer shops and was told they see them almost every day on highway semi tractors. I asked if they had heard of any damage being caused using one and was told -No- they seem to do pretty much what TS Performance says they will do and mine does. The nice part of it is its about a 5 minute install consisting of two wiring harness plugs that get a insert to the programmer. The hard part is getting to the top of the engine on my coach and so I can control it from the drivers seat running the 40' control cable extension from back to front. That was a PITA.

Jim


Posted By: jauguston on 02/15/12 08:47am

Jet A,

In some cases it is not adding extra fuel that gives the increase in horsepower. Most of the newer engines have had their injection time retarded as they have found that is a cheap way to reduce emissions for our government. The programmer I use (MP-8) puts back the injection timing to where it was intended to be by the engine design engineers before the EPA got into the act. Fuel consumption does not increase and there is a "slight" increase in MPG-"slight"-not a lot. EGT is also slightly lower also. You never get something for nothing and the price I pay is my engine will not meet its mandated emissions limit when I turn it up. Sorry but I don't care. There is no required emission testing where I live. I still have the big quiet stock Freightliner 5" muffler.

I wish someone had and would post a stock 5" muffler and 5050XL muffler dyno pull comparison.

Jim


Posted By: sc3283 on 02/14/12 10:53pm

Fire Up ..Great report!!! It is NICE to see truthful claims after an "upgrade" and not all the false hype and BS to justify the expense of the "upgrade"


04 D-Max Crew Dually

96 Monaco Dynasty 36'



Posted By: JetAonly on 02/15/12 03:31am

Different mufflers are great as long as you are buying them to enjoy the sound or appearance. If you want more power you're going to have to buy a kit that adds more fuel.


2000 Monaco Dynasty
ISC350


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