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2018 Chevy Cruze Diesel LT Sedan
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Discussion Starter · #1 ·
Hello everyone. My first post on here. I was hoping to see if anyone has a gen2 diesel that they’ve deleted the muffler on. I’m looking at doing it to mine (I want to get that diesel sound out of it mainly). I’ve only ever seen or heard of the 1.4l gas models getting a muffler delete and they don’t sound bad, but I’d really like to hear about the diesel side of it if anyone has done it and if they recommend anything before actually doing it. I am currently waiting on my 100,000 mile warranty to finish but I’m only at ~32,000 miles. Eventually I’d like to do a full delete but that will be down the line. At that point I’ll just straight pipe it from the turbo and be done with it. But because of warranties I’m at a standstill. If anyone knows anything or finds anything that I somehow missed please let me know. Thanks in advance!
 

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Discussion Starter · #5 ·
I had a good look under my vehicle when installing splash guards but didn’t really pay attention to anything but what I was doing. I know that the gen1 gas models had a massive muffler that ran down the middle of the vehicle. But I don’t think I remember seeing anything but just a regular pipe on mine when I had it off the ground.

Do the Gen 2 diesels have a muffler? The Gen 1 diesels did not have one.

I wouldn't hold your breath on being able to delete - thus far, there has been no delete made available for the Gen 2 - and that was before the EPA crackdown that saw the Gen 1 deletes become extremely scarce (and expensive). Tuning would be a major issue in deleting the Gen 2 - it's proving extremely difficult to crack.
 

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Discussion Starter · #9 ·
So, I actually had to get under my car today because the oil drain door somehow decided it didn't want to stay connected to the entire panel. I did see what looked like a small muffler around where the cup holders would be. If this is actually a muffler I'm not 100% sure since I couldn't really get close enough to see everything there.

Do the Gen 2 diesels have a muffler? The Gen 1 diesels did not have one.

I wouldn't hold your breath on being able to delete - thus far, there has been no delete made available for the Gen 2 - and that was before the EPA crackdown that saw the Gen 1 deletes become extremely scarce (and expensive). Tuning would be a major issue in deleting the Gen 2 - it's proving extremely difficult to crack.
 

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2018 Chevy Cruze Diesel LT Sedan
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Discussion Starter · #12 ·
If you get a chance, can you snap a few pics of the exhaust system?

We have a really good thread that shows the entirety of the exhaust system (via a lift), not long after they came out, which has always been super helpful - but that is only for the Gen 1. Can't say we have anything similar to reference on the Gen 2s.

I'm expecting there to be no muffler, as GM doesn't have any mufflers on any of their other diesel products, since the turbo, DPF and SCR do such a good job of lower the exhaust decibel level.
For sure. I'll grab some when I can and post the here.
 

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Discussion Starter · #19 ·
If you remove every piece of exhaust treatment equipment (oxidation catalyst, DPF, and SCR catalyst) you will get all kinds of CELs as well as a 75 mile countdown for a defective emissions system that will cap your speed at 65mph, 55mph, 45mph, and then 4mph.

How do you plain to "straight pipe" a modern engine with all the emissions equipment?
pickups do it all the time. if there is a kit, and i've heard there currently isn't right now, you'll need to mod the computer to thinking everything is still there. unfortunately it is illegal to do in the eyes of the EPA, but they're just money hungry turds that can suck an egg in my opinion. gen1 cruze had a fair delete kit that at least got rid of the exhaust components. i couldn't say for the EGR or anthing like that though.
 

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Discussion Starter · #20 ·
Here are a couple pics I took with the full pan off, that might be helpful. In hindsight I should have taken a couple of behind the engine too where the DEF injector is. The DPF can be seen in front of the engine, with the DOC out of site on top of the DPF (can be seen under the hood to the right of the turbo ... the DOC and DPF are combined in one unit. There are two EGT sensors in the DPF/DOC unit as well as the two thin tubes that attach to the rubber lines for the pressure differential sensor (you can see the tubes in the corner of the third photo). The NOx catalyst is the resonator looking things you can see at the middle of the car. The DEF injector is behind the engine and a little harder to see as it's fairly high up there. It is before the NOx catalyst. There is an NOx sensor in the tailpipe after the NOx catalyst. There is a particulate sensor just behind the flex pipe seen in the photo under the engine. And the third EGT sensor between the DPF and flex pipe. Unfortunately I didn't take clearer pics of the exhaust parts behind the car, maybe @FlagrantBacon94 could add those to round it out.
I might actually be able to get my car in the air since my manager actually has his own garage and all. its just a matter or getting over there when he isn't busy and letting me use it for a few minutes.
 

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Discussion Starter · #40 ·
is that how the car is? or did you remove 'aero panels' from either side of the exhaust tunnel?
That’s how it is. I had put it in the air using my bosses lift when it was around 5000 miles and there wasn’t any panels. The only panel is for the under side of the engine. I’m sure the gen1 is a little different.
 

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Discussion Starter · #42 ·
Yes. I want to know if the stock ECU can be used with a straight-pipe in place of the DPF, or if tuning is required.
Tuning would alway be required if there’s a sensor involved. Say for a o2 sensor; you’d have to program the computer to think it’s there and working properly if you were to take it out completely. Just an example I could come up with on the spot.
 
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