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Old 07-22-2014, 08:56 PM
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Stacks or back exhaust?

Hello everyone,

I've got a friend who runs dual stacks in his 94 F-250. We had a discussion regarding exhaust systems. He favors the stacks, saying it cools EGT by allowing a shorter distance for exhaust to travel. Although I'm not entirely fond of stacks, anyone have any ideas as to whether stacks make a difference? I know the diameter has a lot to do with it, but I'm scratching my head. Is there a performance increase with stacks versus normal back piping?
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Old 07-22-2014, 09:03 PM
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Stacks make ZERO difference in EGTs. After all there is only a 3" outlet at the back of the turbo, THAT is the limiting factor

Anything more than a 4" single exult is for looks and sound. It make ZERO performance gains
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Old 07-22-2014, 09:48 PM
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X2^^^^^^^^
I went from stock exhaust to 3" dp 4"exhaust which made a difference. Then went to 3"dp with 5" from the dp with 5" stacks and the only change was sound.
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Old 07-22-2014, 09:49 PM
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Dual exit pipes on any vehicle that, by definition, has single exhaust looks.... compensating. A SINGLE stack, done tastefully, can look right, but the real questions you gotta ask yourself are whether you want a hole in your bed, and whether you want the outlet that close to the cab and its occupants.
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Old 07-22-2014, 10:10 PM
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Come on guys you can't tell me this doesn't look totally rad lol
http://www.craigslist.org/about/best...493372708.html
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Old 07-22-2014, 10:17 PM
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This has to help with EGT's
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Old 07-22-2014, 10:27 PM
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Quote:
Originally Posted by Diesel_Brad View Post
Stacks make ZERO difference in EGTs. After all there is only a 3" outlet at the back of the turbo, THAT is the limiting factor

Anything more than a 4" single exult is for looks and sound. It make ZERO performance gains
Alrighty, good information to know. Since I'm not a fan of stacks, it's nice to know I can use my 4" back piping without sacrificing some "magical stack performance booster".
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Originally Posted by madpogue View Post
Dual exit pipes on any vehicle that, by definition, has single exhaust looks.... compensating. A SINGLE stack, done tastefully, can look right, but the real questions you gotta ask yourself are whether you want a hole in your bed, and whether you want the outlet that close to the cab and its occupants.
Well, I'm okay with exhaust being that close to my occupants, however I don't like the fact that I'd have to remove a small amount of space in my bed for a stack. I use my truck for hauling heavy supplies, and I figure I'll use the space under the cab and bed that was given to me...
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Come on guys you can't tell me this doesn't look totally rad lol
best of craigslist: 1998 honda accord 3.0 v-tech dually
That thing looks down right weird AF. I know stacks are common, but CB whips and the whole dually thing? Nah.
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Old 07-23-2014, 07:27 AM
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Quote:
Originally Posted by Ranch Rig View Post
Well, I'm okay with exhaust being that close to my occupants, however I don't like the fact that I'd have to remove a small amount of space in my bed for a stack. I use my truck for hauling heavy supplies, and I figure I'll use the space under the cab and bed that was given to me...
That's always been why I won't go to stacks. The bed is too useful, especially on a 3/4 or 1 ton, to waste that space.
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Old 07-23-2014, 11:59 AM
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For the love of all that's right in this world, please, no stacks. My 2 cents...
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Old 07-23-2014, 12:05 PM
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For the love of all that's right in this world, please, no stacks. My 2 cents...
...unless you do a hood stack! Otherwise, I totally agree.
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Old 07-23-2014, 12:19 PM
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Dude at our local farmers market has a stack setup I like. F-SD C&C with a frame set for a 9-foot bed (the C&Cs have those longer frames), put an 8-foot pickup bed on it, and has a tool box and a stack in the space in between. (Personally, I'd put a fuel tank in there if it were me, but....) Actually a pretty clean looking setup.
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Old 07-23-2014, 01:03 PM
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Quote:
Originally Posted by BBslider001 View Post
For the love of all that's right in this world, please, no stacks. My 2 cents...
It has to be the right stacks on the right truck for it to not look tacky. Very fine line between "That's a sharp truck" and "Man, that guy is trying too hard"
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Old 07-23-2014, 01:11 PM
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Quote:
Originally Posted by BBslider001 View Post
For the love of all that's right in this world, please, no stacks. My 2 cents...
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Originally Posted by BoKnowsDiesel View Post
It has to be the right stacks on the right truck for it to not look tacky. Very fine line between "That's a sharp truck" and "Man, that guy is trying too hard"
All the really matters is if the person that is putting them on his truck likes them.
I had em on my 97 and they will be going on the dually and cN care less what anyone else thinks.
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Old 07-23-2014, 08:05 PM
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the only ones ive ever liked were ones that the stacks were the main uprights of a head ache rack
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Old 07-23-2014, 09:37 PM
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Stacks provide no performance gains over "normal" exhaust routing, IMHO. Stacks serve a purpose and I have no problems with the folks that run them. I keep a camper shell on my truck bed 99.99% of the time, so stacks are not an option for me.

If you're going to add stacks, do it because you want them. They won't add any performance value to your setup. On a side note, my local truck club has sponsored some "Dyno Day" events. The dynamometer shop personnel are NOT fans of trucks with stacks because they usually aren't setup to run a "stacked" truck on the chassis dyno. The shop is smoked out before the dyno run ends.
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Old 07-23-2014, 09:37 PM
 
 
 
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