Dual stacks performance pro or con - Dodge Cummins Diesel Forum
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post #1 of 43 (permalink) Old 09-20-2019, 12:41 AM Thread Starter
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Dual stacks performance pro or con

Sorry if this is in the wrong section.

I bought a stack kit months ago and finally going to install it this weekend (hopefully) and I'm wondering if there are any performance gains or losses from stacks compared to straight pipe.

I currently have a 4inch straight pipe and will be changing to 4 inch to dual 7 inch bed stacks. Will I see any performance changes?

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post #2 of 43 (permalink) Old 09-20-2019, 12:47 AM
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Nope 4" flows enough for the vp.
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post #3 of 43 (permalink) Old 09-20-2019, 12:55 AM
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the only gain you'll see is in cab noise and a massive reduction in resale value.

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post #4 of 43 (permalink) Old 09-20-2019, 01:11 AM Thread Starter
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I like the noise and not for sale lol

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post #5 of 43 (permalink) Old 09-20-2019, 01:34 AM
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There is quite a bit more cab noise and the drone is insane. Now, the definition of "noise" differs depending on what you are doing.

Rolling around through town, or running over to the next town over? It is music to my ears! Sounds like a log truck.

Hooked up to a 5th wheel taking your family on vacation and having the A/C fail in the middle of summer on a 7 day trip? Make sure to bring asprin, and a box of ear plugs. You learn to hate it quick when you have to listen to that noise for hours on end reverberating off of the front of the trailer directly back into the cab.

Needless to say, the tail pipe went back on and I had a 4.5" hole in my bed that was great for draining water.

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post #6 of 43 (permalink) Old 09-20-2019, 01:46 AM
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Quote:
Originally Posted by me78569 View Post
Nope 4" flows enough for the vp.
I agree. The 4 inch kits can handle quite a bit. Depending on what stack kit you have, make sure you have little weep holes on the bottom of the elbows to allow for water drainage. If you don't then you may wake up one wet morning with lots of soot all over the truck on start up.

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post #7 of 43 (permalink) Old 09-20-2019, 02:40 AM Thread Starter
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Originally Posted by Dude's Diesel Performance View Post
I agree. The 4 inch kits can handle quite a bit. Depending on what stack kit you have, make sure you have little weep holes on the bottom of the elbows to allow for water drainage. If you don't then you may wake up one wet morning with lots of soot all over the truck on start up.
How big should I make the weep holes and should i put them at the elbow in the "Y" pipe and both elbows under each stack? So 3 separate elbows...

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post #8 of 43 (permalink) Old 09-20-2019, 03:09 AM
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The weep holes do not have to be extremely big. Just big enough to let water drain out. If im not mistaken i may have used a 1/4 inch bit.

You should just be able to do it at the y pipe.

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post #9 of 43 (permalink) Old 09-20-2019, 08:26 PM
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Hood Stack, Hood Stack, Hood Stack!!!
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post #10 of 43 (permalink) Old 09-20-2019, 08:39 PM
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Stacks are a love/hate kinda thing. Its not really my thing but if you don't mind the noise or the droning go for it. No pros or cons in regards to power...just asthetics and noise.

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post #11 of 43 (permalink) Old 09-20-2019, 09:11 PM
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Quote:
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Stacks are a love/hate kinda thing.
Indeed. I like them on my Peterbilt, even though they are "only" 6-inchers (stock is 5"), but would pay not to have anything like that on my Ram 3500.

Maybe if we start telling people that the brain is an app, they will start using it?

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post #12 of 43 (permalink) Old 09-20-2019, 09:23 PM
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Put wheep holes at elbows and below the y. You’ll still get black soot on your truck.

Stacks look alright if done nicely on a 2nd gen. I was gonna use cat stacks. And hwy driving and you’ll get tired of the noise. Above the cab will make it more bareable in the cab but I think for looks they are better suited lower.

Everything has its place and noise wasn’t the reason I never went through with the stacks. Same as 3/4 tons rolling round with cb antennas. Dual stacks belong on a semi.

But still cool to see now and again on an old Cummins.

Post pic when done
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