Stacks and flex pipe - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 28 (permalink) Old 02-09-2013, 01:31 AM Thread Starter
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Stacks and flex pipe

I was talking with a guy who said he'd help me put stacks on my truck who suggested flex pipe for the bends. I personally don't like flex pipe because of added turbulence it creates ie back pressure at least that's what I know in a gas engine. He claimed it wouldn't make much difference with a diesel and that most of the kits come with flex pipe. I'm new to diesels in general do any help would be greatly appreciated

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post #2 of 28 (permalink) Old 02-10-2013, 12:22 AM
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Re: Stacks and flex pipe

you need at least 18" of flex pipe.the reason is, if you dont the system will be rigid,meaning no flex...personally, i got my bends at "truck Pro" and put the flex pipe before the 90 into the bed..

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post #3 of 28 (permalink) Old 02-10-2013, 01:25 AM Thread Starter
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Re: Stacks and flex pipe

I see that's a very good point I don't want to go through the work of installing the stacks and them crack the welds thanks for the reply PS do you have any pics of your setup?

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post #4 of 28 (permalink) Old 02-10-2013, 02:05 AM
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Re: Stacks and flex pipe

i dont have any of under the truck..here are the ones I have






The stacks are now powder coated...


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post #5 of 28 (permalink) Old 02-10-2013, 03:12 AM
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Re: Stacks and flex pipe

I ran a 45 off the bottom of the stack because i didnt want a sharp 90 in there. If i had to do it again i wouldn't do it. Stack is cool for about a month, after that they're a nuisance
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post #6 of 28 (permalink) Old 02-10-2013, 01:46 PM Thread Starter
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Re: Re: Stacks and flex pipe

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Originally Posted by Joeyd61 View Post
i dont have any of under the truck..here are the ones I have






The stacks are now powder coated...

Man that looks good. Very nice truck how much tire and lift do you have under it?

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post #7 of 28 (permalink) Old 02-10-2013, 01:49 PM Thread Starter
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Re: Re: Stacks and flex pipe

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Originally Posted by bruce51d View Post
I ran a 45 off the bottom of the stack because i didnt want a sharp 90 in there. If i had to do it again i wouldn't do it. Stack is cool for about a month, after that they're a nuisance
Because of the noise or? I haul a car trailer or will be when the car's done. I don't want the soot blowing all over the car or the trailer

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post #8 of 28 (permalink) Old 02-10-2013, 03:21 PM
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Re: Stacks and flex pipe

If its any kind of moisture in the air whatever you have behind you will be covered. It could be misting and if i had my window cracked i would get black crap on my back
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post #9 of 28 (permalink) Old 02-10-2013, 05:27 PM
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Re: Stacks and flex pipe

the stacks while hauling loads drive me crazy..way too much exhaust drone.. even the 6637 with my BB 38 drove me nuts...i guess you could keep the back slider shut..but i like mine open...

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post #10 of 28 (permalink) Old 02-10-2013, 07:51 PM Thread Starter
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Re: Re: Stacks and flex pipe

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Originally Posted by bruce51d View Post
If its any kind of moisture in the air whatever you have behind you will be covered. It could be misting and if i had my window cracked i would get black crap on my back
Is this with stacks or?

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