5" stacks on a truck looks silly. I have a customer with a 6.7 dually and we did 5" turbo back, DPF delete and have 6" miters. Looks good and is NOT too loud at all. We do however have an aeroturbine muffler under it as well. Keeps the noise level in the cab in check but still sounds grunty when gettin on it.

---AutoMerged DoublePost---

going from 5" to 8" on stacks will gain you nothing. it is only looks.





get a set of stacks that fit the look of the truck. and what YOU want

 

I have the MBRP cool dual's 4 inch kit. It looks good, symmetrical, not much sound out of them at all though........YET. They are gonna be coated black before too long....

 

here we go, a truck with 9" of lift and 6" stacks just did not look right




Now with 8" stacks things are in better perspective

 

yeah that big of truck looks like crap with 6" stacks, and yes if you have a big truck like that get at least 7"....and also dont get turnouts IMO they just dont look good, get flat tops or mitres

 

man that looks good