groundpoundinlt1

iTrader: (57)

Just as the title says. Overkill or beneficial? Reason asking is i have access to a 4" duramax exhaust and was gonna fab it up to work on my new truck.

Vortec350ss

iTrader: (20)

Overkill unless you have boost. Even then not necessary.

SYRacing

iTrader: (2)

not necessary is right, but so sweet when you do it

Bama2door

I've got a 4" FloPro system on my 2500, but if it was stock I would say it's definitely not worth it. You can definitely tell the low end is lacking a bit bc of less backpressure.

Besides, even the stock 6.0 exhaust config is already pretty huge for a stock engine. I'd keep it the way it is and add a nice big Magnaflow or a denali 6.2 muffler (have my old one for sale if interested PM me)

zachm89

iTrader: (16)

im running 4" with a pair of borla XR-1's back to back, the smallest ones. sounds excellent to me but definitely overkill unless youre boosted, and even then its still overkill. but sounds awesome

Vortec350ss

iTrader: (20)

Sounds awesome... but its loud as hell.

zachm89

iTrader: (16)

Nah, just depends on what you run for a muffler. Or in my case, mufflerS. My boss has an 01 ext cab with LTs, no cats and single 3" to crappy single chamber flowmaster 10 series and its WAY louder than my truck, but doesnt sound nearly as good. But what do you expect from a flowcrapper. Its loud, but definitely not too loud.

Vortec350ss

iTrader: (20)

So those borla's work well, huh? I'll keep that in mine if I ever need to tame mine down.

dirt track racer 81

iTrader: (45)

Stock cam with manifolds it's overkill

timmay208

iTrader: (4)

really no need for 4" untill your making 600+ IMO, at my work we have run 4" up to 1khp on diesel trucks