no muffler...yes or no?
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Freshman User
Joined: Sep 2008
Posts: 49
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From: Saline, MI
no muffler...yes or no?
i have a 04 6.0L with bullydog, volant intake, MBRP down pipe, MBRP cat-delete pipe, and a Borla muffler. would i gain any fuel mileage or power by removing the muffler. or would i be doing more harm than good?
Elder User
Joined: Jun 2008
Posts: 724
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From: Sarasota, fl
In my knowledge you don't gain power or fuel mileage with exhaust mod on the 6.0 diesel, but you definitely lower your EGT, and if you have a nice full system, you get an awesome tone out of your truck. In the other hand without muffler you could end up "too loud", and IMO that does not sound good....
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Freshman User
Joined: Sep 2008
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From: Saline, MI
im not worried about being too loud. it has an awsome tone right now. after about 2500rpm it sounds very similar to a quite 4.6L cobra. i love it but i want it just a lil bit louder without doing any harm.
Senior User
Joined: Feb 2007
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I would run the muffler. From what I know you do need some backpressure for the VNT turbo, you need the pressure difference between the exhaust side and the intake to flow the exhaust into the ERG system. It is also possible that you might or might not under/over speed your turbo.
Correct me if im wrong.
Correct me if im wrong.
Senior User
Joined: Feb 2007
Posts: 131
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Tossed the muffler on my 4" system, cat is still on... not loud until you get on it! Highly recommend!
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FTE Legend
Joined: Jul 2005
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From: Millersville, MD
You do NOT need "back pressure". If you like it loud, do what I did....straightpipe it! Lost about 100 degrees on EGT!
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Thread Starter
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Freshman User
Joined: Sep 2008
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From: Saline, MI
did you notice any difference in power, economy, smoke, or throttle response
Lead Driver
Joined: Jun 2007
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From: Corvallis, OR
I would run the muffler. From what I know you do need some backpressure for the VNT turbo, you need the pressure difference between the exhaust side and the intake to flow the exhaust into the ERG system. It is also possible that you might or might not under/over speed your turbo.
Correct me if im wrong.
Correct me if im wrong.
The pressure drop across the turbo is what makes it spin, more pressure drop means more boost. You won't over speed your turbo as the boost level you reach limits that, but you may build SLIGHTLY more boost SLIGHTLY faster. Very little impact on the EGR system, if any, since back pressure for the EGR is provided by the turbo.
Posting Guru
Joined: Oct 2005
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loud, illegal if your truck came with a cat and you take your cat off, and some people say the exhaust tone may have a drone on some highway speeds.
i love my exhaust but i do have a MBRP 4" muffler and don't have any drone that i can notice from inside the cab.
i love my exhaust but i do have a MBRP 4" muffler and don't have any drone that i can notice from inside the cab.
New User
Joined: Jul 2008
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Mines got both deleted and its actually pretty mild. The turbo screams all the time but its the only thing I can hear until about 2K. Its just as quiet as with the cat and muffler on below that.
Mines got the stock pipe size right now though so I don't know if that would make it quieter.
I'm planning 4 inch soon with a single stack, but i'm putting a muffler on then.
Mines got the stock pipe size right now though so I don't know if that would make it quieter.
I'm planning 4 inch soon with a single stack, but i'm putting a muffler on then.
