My father inlaw bought an 08 dodge 6.7!!! So excited!!! He had to take it to the dealership the other day because of a boost senser. The guy at the dealership sayd it needed to do a regen. Well the light still on so he wants to get rid of that crap so we are looking at an egr delete dpf delete and a smarty tuner!! To delete the dpf we are just going to go with an aftermarket exhaust and my ? is which do yall like better? I have seen alot of guys putting the 5" exhausts on the 6.7s and was wondering if they sound better than a 4"? Is there any real performance gain over a 4"? Which sounds better?? Thanks guys!

 

The sound between the two are very comparable. I've stood next to both and if it was not for the larger diameter of the 5 inch pipe hanging out the rear, I wouldn't have known better.

No big performance gains between the two either on a mildly modified truck.

James
RSD

 

the sound is mostly in if you use a muffler or straight pipe 4 inch looks stock 5 inch is most definitely not.

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i kind of like my 5 inch

 

Ok i didnt thank it was really that much different other than looks. He probly will want to straight pipe it tho so 5inch is probly what he will go with thanks

 

5 inch straight pipe is gonna be LOUD

 

i would 5" it with a resonator that would sound perfect imo

 

WE LOVE LOUD!!!

 

5"

 

5" get my vote, especially on the Cummins.

 

depends on what you like. some guys like no muffler and some guys dont. i have had guys come back to me for a muffler delete pipe and some come back for a muffler. i got a 5 inch with magnaflow muffler and i like it.