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Discussion Starter · #1 ·
I have a 97 Powerstroke with a full 4" MBRP exhaust but i also want like a single 8" stack too. What i am looking for is something like a valve where you can either have the exhaust run through the stack so you can show off to friends or you can go to the MBRP and have a little quieter ride. I have found some sites where it uses a flapper but you would think the flow would tend to run through both. Does anybody have any good sites where i could find one.
 

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Easiest way to do it would be to 'T' the stack off of the MBRP, and fab up two butterfly type valves to work in tandem at the 'T'. One of them controlling flow through the stack, and one of them controlling flow through the MBRP. One un-avoidable downside I see is having a sharp 90* at the union between the two pipes which would increase back pressure.
Interesting idea...
 

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Discussion Starter · #3 ·
Do you think you could use a gradual Y pipe and put he butterfly valves in that and it would reduce the bend in the pipe up to the stacks. And what kind I valves air or electric. And how easy do you think it would be to try and either make this or find one to buy.
I think it would be kinda cool if I could get it to work but I'm not quite sure.
 

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guy on diesel power has one on his gm, stack was for when he goes to pulls

 

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Discussion Starter · #5 ·
How well does that work because it seems like even with the valve open the flow of the exhaust would still wanna go strait a little but most of it would still go up. and about how much did that cost him.
 

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no idea what it cost, watch them do an install on a car on stacy david's gears on speed channel, one was open headers, the other was full exhaust with mufflers, that particular set up will take the past of least resistance, i just google imaged that one, i will look for a better kit real quick
 

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it's on page 102 of diesel power mag, titled deadly duramax daily driver in the index, and the guy used 2 of those valves to close one off when the other is in use, and vice versa. i cant find a pik, computer being stupid today, here is a cut out
Summit Racing SUM-670136 - Summit Racing® Exhaust Cutouts - Overview - SummitRacing.com
and here is a valve though
Summit Racing SUM-670150-2 - Summit Racing® Electric Exhaust Cutouts - Overview - SummitRacing.com
and 2 valves should get your the desired effect
 

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Discussion Starter · #9 ·
Do you think it would be easier and cheaper to build my own. With a Y pipe and two butterfly valves in each slot of the Y pipe. and do you know a good site for stacks.
 

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cptrucks.com, xdp, they sell stacks, and i would just by the cut out and incorporate it into the exhaust you want to build, good luck tho, and yes 2 butterfly valves are gonna be needed to completely eliminate the exhaust from one set up or the other. i personally think it's point less to do both, just go for the stacks imho
 

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^Agreed, just go with stacks man.
 

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you check the for sale section, they come up often
 
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