I have the MBRP single stainless system installed with the cat removed I personnally don't mind it to much but it does sound funny and I have alot of people tell me that. I mainly did the exhaust for the EGT's to be lower I liked the quite factory sound is there any different mufflers out there that arent so loud and hollow?? Or will putting the cat back on help to?? But then the EGT's might get higher?? Please some of you guys out there who have experimented with this stuff help me out I really want to quite it up without losing the flow.

 

What do you mean in "sound funny"?? I love the way mine sounds, and I get a lot of compliments too.

you can take a look at the donaldson or nelson's 51" mufflers...

 

Ya but do you still have the cat installed?? How much of a difference will it make if I reinstall the cat??

 

MBRP makes a resonator that you can add to your exhaust to make it quieter. I would not put the cat back on. Your EGTs will increase.

 

Nelson's are great!

 

Where can you find the Donalson 51" muffler?

 

I still have the cat on my 2006 2500. Are you saying I can take it off?

 

I second the Nelson, 51" it's only a bit louder than stock but there is no mistaking it's different. Also compared to the straight pipe I ran for a year there was no change in EGT's.

Edit; 86131M, bought right from Cummins.

 

What does your annual state vehicle inspection include? If they look for the cat and know that a 04.5 and newer came with one, then they might have a problem with it. Other than that, Take It Off!

 

I have the duals without a cat and I will tell you this, it gets quieter after some smoke is run through it. give it a few weeks and it will quiet down a bit.