Down pipe

[Mchance94]

Hi guys. I tried doing some reading on previous posts but couldn’t find what I was looking for.
I have a 2018 Cummins. I ordered a 4” exhaust and when It got to my house I opened the box and realized it’s not turbo back, it’s a down pipe back so basically what I am trying to figure out is if there is a CAT on the factory down pipe or is that a flex joint I see? If it is a flex joint I plan on using what I have but if it’s a cat I’m gona try to buy turbo back because I would like everything deleted. Thanks and sorry if that is confusing!!

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[watersupply189]

Hi guys. I tried doing some reading on previous posts but couldn’t find what I was looking for.
I have a 2018 Cummins. I ordered a 4” exhaust and when It got to my house I opened the box and realized it’s not turbo back, it’s a down pipe back so basically what I am trying to figure out is if there is a CAT on the factory down pipe or is that a flex joint I see? If it is a flex joint I plan on using what I have but if it’s a cat I’m gona try to buy turbo back because I would like everything deleted. Thanks and sorry if that is confusing!!

That is a resonator. I left mine on because it helps cut down on the drone. I only did the SS delete pipe and used the rest of my factory exhaust. Saved a lot of $$$ doing that.


2016 Ram Laramie 3500 (DRD), G56, 6.7, Rough Country Leveling, HID headlights, Morimoto LED fogs plus a whole lot more!

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[Mchance94]

So you don’t think the restriction is enough to worry about ??

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[Mchance94]

Also do I need to worry about it getting clogged up over time ??

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[watersupply189]

So you don’t think the restriction is enough to worry about ??

Very little restriction


2016 Ram Laramie 3500 (DRD), G56, 6.7, Rough Country Leveling, HID headlights, Morimoto LED fogs plus a whole lot more!

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[watersupply189]

Also do I need to worry about it getting clogged up over time ??

It won’t clog like the DPF and SCR will. Think of it as a little mini muffler. LOL


2016 Ram Laramie 3500 (DRD), G56, 6.7, Rough Country Leveling, HID headlights, Morimoto LED fogs plus a whole lot more!

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[Mchance94]

I like the way you worded that.

Thank you the more I look when doing 4” mostly all the kits are down pipe back which makes me believe it’s not that big of a deal.

Another thought in my head is am I going to need a collector gasket when bolting up to the down pipe, this is my first diesel sorry for all the little questions.

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[InlineSix.7]

There should be a metal type gasket between the turbo and the down-pipe that you can reuse as long as it doesn’t get bent.

Just be patient when bolting it up as you have to keep everything aligned just so.

^^ sorry, thought you were asking about the gasket farther up the line at the turbo/down-pipe connection.

If you got a delete pipe for the DPF it should come with a new collector gasket.


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[watersupply189]

I like the way you worded that.

Thank you the more I look when doing 4” mostly all the kits are down pipe back which makes me believe it’s not that big of a deal.

Another thought in my head is am I going to need a collector gasket when bolting up to the down pipe, this is my first diesel sorry for all the little questions.

Yes sir it’s not that big a deal.

The gasket is metal and you can reuse the gasket as long as you don’t booger it up removing it.


2016 Ram Laramie 3500 (DRD), G56, 6.7, Rough Country Leveling, HID headlights, Morimoto LED fogs plus a whole lot more!

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[CzechRooster]

Unless Ram changed something, that is a flex joint as on my 2015. The 2013 models had a small Cat at that location. I ordered a turbo back system because some info out there claimed it was a Cat only to find out it was a flex joint. Unless you go to a 5" exhaust, the factory downpipe with the flex joint is better than any aftermarket set up in my opinion.

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