Exhaust install - Chevy and GMC Duramax Diesel Forum
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post #1 of 15 (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 15 (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 15 (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 15 (permalink) Old 11-09-2019, 07:55 PM Thread Starter
 
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Bung*
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post #5 of 15 (permalink) Old 11-09-2019, 08:16 PM
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post #6 of 15 (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 15 (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 15 (permalink) Old 11-12-2019, 09:28 AM
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What am I missing here?
Uniformity?
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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post #9 of 15 (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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post #10 of 15 (permalink) Old 11-15-2019, 10:38 PM
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I think dual exhaust looks good on all trucks but for functionality it does nothing for these new diesels that have the def system unless you can engineer a dual dpf with dual sensors and yatta yatta yatta. That being said from the outside looking in it makes the truck look meaner unless its 9 inch stacks like really boys these freightliners and mac's and peterbuilts dont even have that big of stacks let's get real and the Cummins with dials is that for bank 1 and bank 2? Is that front 3 pistons and back 3 pistons? Cause I know that's not how its plumbed but whatever it is what it is I think the the dual pipes out the back looks good but more functional on gassers

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