Exhaust install - Chevy and GMC Duramax Diesel Forum
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post #1 of 17 (permalink) Old 11-09-2019, 12:01 AM Thread Starter
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Exhaust install

Just bought a 2017 L5P. I’m putting an aFe Atlas dual exhaust on it. The stock exhaust has 3 sensors downstream of the DPF. The new exhaust only has two. Anyone else run into this problem?
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post #2 of 17 (permalink) Old 11-09-2019, 06:30 AM
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Not 100% sure but it appears to be an egt sensor thats hanging. May want to call afe and ask them about it or who you got the exhaust from. It will either throw a cel for it or just max the egt sensor out on a gauge. Ones a problem one isnt.
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post #3 of 17 (permalink) Old 11-09-2019, 07:54 PM Thread Starter
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I’m thinking I’ll cut the bing out of the old one and weld’er into the new one
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post #4 of 17 (permalink) Old 11-09-2019, 07:55 PM Thread Starter
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post #5 of 17 (permalink) Old 11-09-2019, 08:16 PM
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That's what i would do

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post #6 of 17 (permalink) Old 11-10-2019, 11:00 AM
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I put dual exhaust on and had to shorten one pipe so the lead would reach, not much give over there

To many vehicles to little time! New LP5 owner first 2017 GMC Denali Duramax
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post #7 of 17 (permalink) Old 11-12-2019, 07:36 AM Thread Starter
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I wish I had read the reviews on aFe before I purchased. I’m not impressed. Besides the absence of the sensor bung, the fitment pretty much sucks. The outlets are impossible to match. Spent hours twisting, adjusting and cussing. Nowhere in their instructions does it say you’ll need a torch to install. You will if you want your tips to somewhat match.

I cut the bung out of my stock exhaust and welded it into the new one. Seems to have worked.

Thanks for the replies👍
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post #8 of 17 (permalink) Old 11-12-2019, 09:12 AM
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Someone help me out here - last time I crawled under my Duramax, I do not recall any possible way to fit it with dual exhausts. You've got one big (looks like about a 4") header pipe. Drops down to where it levels out to the CAT, then to the DPF.

(well..not that I am admitting anything, but havnt crawled under my Duramax since then....who knows what could have happened......you can draw your own conclusions about how much I love those cute little fuzzy-chinned bunny wabbets…!)

Yes, I "get it" some anti bunny wabbet folks will remove said devices, and some of them will put in a "Y" so that from that point on, they can have two exhaust pipes going out to the back of the truck.

Does just having two exhaust pipes sticking out of the back of a Duramax accomplish ANYTHING? What am I missing here?

2013 3500 long bed crew cab. Purchased at approx. 80,000; now have 91,000, convert to CP3. DPF "triggerd" a limp mode, so was cut out of the vehicle & cleaned by a DPF cleaning co., on re-installation, everything back to normal. Would never ever think of something as nasty and as anti bunny wabbet as a full-delete...after all..dosnt everyone like the fun & excitement of being stuck by the side of a Interstate in the ran while towing when one's truck's computer decides to go into "limp mode"...?.
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post #9 of 17 (permalink) Old 11-12-2019, 09:28 AM
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What am I missing here?
A balanced look?
Dual thrusts for launches?

A single on one side.....is like living with crooked pictures hanging on every wall in the house.

So let's put a huge oversized tip on the single.
That'll blend.

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Last edited by Hook'em_Horns!; 11-12-2019 at 09:30 AM.
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post #10 of 17 (permalink) Old 11-12-2019, 09:38 AM
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It's called symmetry.........

For some one as OCD as me, it's either that or medication.
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