Does size really matter with exhaust?

[DIRTY DIRTY]

Oh hey, I didn't realize you had your own shop. Awsome, congrats on the new shop by the way. I think that was you. So not to sound even dumber, but Im looking for a turbo-back exhaust. I'm not really sure the difference between the front pipe, down pipe, up pipe, ect.. When I did the exhaust on my powerstroke it was much simpler. But judging by your prices I will probably order from you. So could you clearify me a little?

 

[othrgrl]

No one makes a true turbo-back kit for the Duramax. The LB7 has a 6 bolt flange for the downpipe and a V-band clamp at the bottom. Apparently the exhaust guys decided the down-pipe was part of the turbo and that they would start calling the front pipe the downpipe. Since then a few have corrected their terminology. Anyway, any turbo-back or down-pipe back exhaust you order will only go from the stock down-pipe back - if they list a 4" down-pipe they are actually refering to the front pipe.

So my prices above will get you from the down-pipe back. The factory downpipe has a 3" flange connecting it to the front pipe and a 3" inlet at the turbo, so a 3" down-pipe is the biggest thing that makes sense for a stock turbo. Diamond Eye and MBRP are your 2 choices of down-pipes available right now for the 04.5+ trucks. I prefer the Diamond Eye for the fit, finish, and heat wrapping. It runs $202.34 + shipping.

The front pipe is the front piece of the exhaust sytem under the truck, on LLY and newer trucks it includes the cat.

The up-pipes are what go from your exhaust manifolds up to the back of your turbo. Your Ford had up-pipes too, but a cummins doesn't - the turbo is mounted directly to their exhaust manifold.

The down-pipe is what goes from the outlet of the turbo down to the rest of the exhaust system.

Hope this helps you and anyone else that is confused.

 

[MadMaxx61]

up pipes = Go from the exhaust manifolds to the turbo pedestal

down pipe = gos off the turbo and down to the front pipe

front pipe = gos from the down pipe to the CAT/DOC-back exhaust (it is more of a CAT/DOC delete pipe)

Also just a bit more info from you any member you see that has a nickname in orange is a Vendor. Most have shops or sites or make stuff on the side.

So
Orange = Vendor
Green = Moderator/ Super Moderator
Red = Administrator or Owners


Yes I am a slower typper they you Dustin lol

 

[DIRTY DIRTY]

I think I learned more on this site tonight then I have from talking to anyone in my area who claims to know something about diesel trucks. And thanks for the color coding MadMax. Well Dustin, I guess I'll give you a call in the next few days and we can decide on an exhaust for me. Thanks for being a big help guys!

 

[Cornell]

I knew I wouldn't need the 5" exhaust but I got it because of the deeper sound.

I think it sounds better than my buddies LBZ with 4"

 

[wes06dmax]

I had a 4 with a 6 inch tip and it was so loud and then I bought a 5 inch mbrp and its not as loud and the drown is alot deeper and I wanted to paint mine black did that with the rustoleum high heat paint and it lasted about a week then I painted it with the rustoleum truck bed stuff and its doing awesome no rock chips or anything and it handles the heat too

 

[duramaximizer]

I read in diesel power mag (take it for what it's worth) something about exhaust size with displacement and rpm. After reading it, I won't get anything but a 5 inch, but I don't think you actually got the advantage until above 3000 rpms or something.

 

[duratothemax]

For those in "no salt" states, aluminized is fine. Salt will work it's way through aluminum.

I disagree Pat...the aluminized exhausts hold up (surprisingly) excellently in salty/wintry states. The 409ss exhausts are an absolute joke. My mbrp exhaust looked like shit after 1 winter, and two of my buddy's aluminized (and 400 dollar cheaper) mbrp exhausts still look brand new after 4 winters.

304 is nice, because it will not rust at all, and looks shiny, but its EXPENSIVE.

I cant bring myself to spend that much money on something you barely see, so without a doubt, I would recommend aluminized to ANYONE regardless of where you live, unless you have 1,200 dollars burning a hole in your pocket.

 

[LBZ]

5inch is much cooler though!!

And heavier!!

 

[LBZ]

........The 409ss exhausts are an absolute joke. My mbrp exhaust looked like shit after 1 winter, and two of my buddy's aluminized (and 400 dollar cheaper) mbrp exhausts still look brand new after 4 winters.

304 is nice, because it will not rust at all, and looks shiny, but its EXPENSIVE.
.......

I agree. 1 winter and my MBRP was rusted to hell.

But will it get a hole in it faster than aluminum exposed to salt would, I don't know but as far as appearances go, stainless 409 gets a thumbsdown for being of any sort of decorative use.

 

[Cornell]

I disagree Pat...the aluminized exhausts hold up (surprisingly) excellently in salty/wintry states. The 409ss exhausts are an absolute joke. My mbrp exhaust looked like shit after 1 winter, and two of my buddy's aluminized (and 400 dollar cheaper) mbrp exhausts still look brand new after 4 winters.

304 is nice, because it will not rust at all, and looks shiny, but its EXPENSIVE.

I cant bring myself to spend that much money on something you barely see, so without a doubt, I would recommend aluminized to ANYONE regardless of where you live, unless you have 1,200 dollars burning a hole in your pocket.

Completely agree, I've have MBRP Aluminized on both of my duramaxs and had no problems at all

 

[Noreaster]

Theres an exhaust cleaner you can get at some truck stops that you spray on, rinse & it will take most of the rust/crud off. I forget what its called. Majority of the crap is from 409 being magnetic.

 

[63chevyll]

I think I learned more on this site tonight then I have from talking to anyone in my area who claims to know something about diesel trucks. And thanks for the color coding MadMax. Well Dustin, I guess I'll give you a call in the next few days and we can decide on an exhaust for me. Thanks for being a big help guys!

same here