TowRig.com - Diesel Discussion and Tow Tech

Before you guys go out and purchase an aftermarket 4" or 5" cat back system get a load of this. We straight piped my new 07.5 today and it has made maybe 1% difference in (in cab) noise. Factory muffler is already straight through.
http://www.gorowan.com/2007ram/images/DSC_5777.JPG
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that thing is TINY compaired to the 5.9L ones...

i guess the PDF is a muffler as well. any performance issues?

Not so far. I have noticed that the cat & DPF are two units. On the chassis cab models it is all one unit.

What does the exhaust sound like outside? Does it have any kind of signature strait pipe Cummins sound when accelerating?

How loud is it.... scale 1 to 10, 1 being a stocker and 10 being a strait piped 5" 12v.

NO WAY.. It is very quiet. The motor from inside the cab actually sounds like a big block gas with 4 tube headers with a loud radiator fan.

Oh....that sucks....:doah:

For the guys that like the first generation clatter and really loud exhaust :mad: You will not get it with the 6.7L.

was the delete pipe from genos garage?? just did mine over the weekend and like you said not much of a difference....but the problem is, it does not line up the rear factory hangers very well at all....the rear section has fallen of twice since yesterday it just wont line up with the rear hangers.....genos said it was a factory fit....well its not. i am gonna have to go to a muffler shop and have the guys weld some new hangers or cut 1-2 inches off the delete pipe to make everyhing aling properly. i should have coffed up some real $$$ and bought a 5 in dpf back system knowing it would work with basic hand tools in the driveway....well any info would help, thanks....

Installation of MBRP DPF to Tip
Dodge 3500 Dually 6.7L Powerhouse.
Click here! (http://www.gorowan.com/2007ram/MBRP/)

Whats the point of putting 5 " exhaust on? You still have the DPF. That helps you in no way. Biggest waste of money.

1350, Do you gross 26,000#s when you tow? I do and it makes a difference. Not a waste for me.:popcorn:

Sorry just dont believe it. It cant, you dont have anymore flow than before...its still 4 inch from the turbo into a big crappy DPF! just dont buy it. Now if you cut that DPF....

There is a report in one of the diesel mags about the less constriction of mandral bends and factory bends. The factory tailpipe adds even more restriction to the entire system. My egt gauge has proved the difference. Just tell me how much you tow heavy? Factory pipe has less bends.

http://www.gorowan.com/2007ram/MBRP/pipe_compare.JPG

I keep forgetting about the factory bends. I guess that should help a bit. But a new 4 inch aftermarket would to the trick.

The most ive towed with this truck was about 14-16k Not very often. 8+ is pretty usual.