Codes

[SHobbs]

I have searched for an answer to no avail. If you were to go with a straight exhaust from the DPF back would it cause a code or any other issues? I have thought about gutting the cat and eliminate the muffler but not sure if it will cause an issue.

 

[Jim W]

If my memory serves me right the exhaust system is set up as follows: the down pipe has the diesel oxidation catalyst in it and then the NOx Absorber catalyst is next and then the Diesel Particulate Filter. All of the sensors are in the DPF with none in the other two catalysts. I would see no advantage to eliminating the two catalysts with the DPF still connected; the DPF will still limit the amount of exhaust that can escape from the engine and acts as a muffler too. I also do not see any benefit with an added aftermarket exhaust system downstream from the DPF, if you are looking for an improvement in sound and flow of the exhaust system this will not happen with the DPF intact. Save your money for some other worthwhile improvement.
Jim W.

 

[Bob4x4]

Lol. The dash will light up like a chrismas tree. All the hardware is monitored. If anything is amiss it will let you know. Inane cases defeating power till it is corrected

 

[HBarlow]

Gutting the catalytic convertor will probably change back pressure slightly but enough to be detected by the ecm. Modifying the converter and removing the muffler will accomplish nothing, won't even change the exhaust sound level. It will make your truck in violation of emissions standards and if noted will be a problem.

 

[Wayne M.]

Ok. Here's one explanation. The DPF Has 2 small tubes, one before the core, one after. These tubes run to a sensor that can compare the pressure before and after the core. This is known as the DPF differential pressure sensor. There is always a slight difference since there is a core there, but as the soot builds, the PCM watches this and is one factor in calling for a regeneration, and is how the soot level is calculated. If you remove the core and cause the pressure differential to be zero you will have big problems.

The same sensor is used in some EGR systems to measure EGR flow.

 

[Mark Craig]

S Hobbs,

If you mean a DPF back exhaust it will work fine and no codes. We sell tons of them and it does get you a little more "diesel" sound but don't expect a lot of volume change. So long as you keep all the Cat's and DPF in place you'll be 100% fine.

Mark @ DPPI

 

[Cummins12V98]

I did the muffler elimination kit from Geno's and it did increase the rumble a slight bit and no codes. I doubt it did a thing for mileage or performance. Just reduced my wallet a bit and the weight of the truck.

 

[Bob4x4]

Anything behind the aftertreatment is legal and will not cause any cel or power improvement-wasted money

 

[SHobbs]

Guess they have these things locked down. I know very little can be gained from exhaust modifications, I just can't get used to how quiet this puppy is.

 

[HBarlow]

S Hobbs,

If you mean a DPF back exhaust it will work fine and no codes. We sell tons of them and it does get you a little more "diesel" sound but don't expect a lot of volume change. So long as you keep all the Cat's and DPF in place you'll be 100% fine.

Mark @ DPPI

Isn't the catalytic converter downstream of the dpf?

If so you are wrong.

Are you offering self-serving misinformation for profit on TDR?

 

[firemansdiesel]

Just the muffler after the DPF. DPF back exhaust works without issue, but waste of money. Does absolutely nada for sound or "performance".