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Catted DP’s installed on 2020 C63 Coupe

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Old Jul 1, 2020 | 01:23 PM
  #101  
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2018 Mercedes c63s sedan
Modalworks downpipe Install

Originally Posted by deftronix
Are you running the modal works?
yes I think it’s just an issue related to my car, as it as happened prior to the modalworks downpipes install. Gonna take a look at plugs and coils after I try and get an updated flash from renntech to take care of the downpipes codes.
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Old Jul 2, 2020 | 02:13 PM
  #102  
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Getting the mini cat spacers installed right now, I'll know if it keeps the CEL off over the next few days. Before spacers it would come on after 50-150 miles.
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Old Jul 2, 2020 | 02:24 PM
  #103  
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Catted DP install

Originally Posted by BrianShaw23
Getting the mini cat spacers installed right now, I'll know if it keeps the CEL off over the next few days. Before spacers it would come on after 50-150 miles.
please keep us update brother as to how it tackles the issues that your having, also if you could let us know what brand you ended up going with that would be awesome
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Old Jul 2, 2020 | 02:56 PM
  #104  
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The whole point of getting catted downpipes is not to get a secondary O2 sensor code.
So you all are running catted downpipes and still chasing how to get ride of the CEL? Use quality high flows cats and you will not get a CEL.
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Old Jul 2, 2020 | 03:04 PM
  #105  
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Originally Posted by shardul
The whole point of getting catted downpipes is not to get a secondary O2 sensor code.
So you all are running catted downpipes and still chasing how to get ride of the CEL? Use quality high flows cats and you will not get a CEL.
I have HJS 200 cell downpipes from Red Star and still got a CEL on my 2020 C63s. Code was for cat inefficiency.
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Old Jul 2, 2020 | 03:53 PM
  #106  
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Originally Posted by BrianShaw23
I have HJS 200 cell downpipes from Red Star and still got a CEL on my 2020 C63s. Code was for cat inefficiency.
Lol, exactly. Brian, you saved me like $2k as I was thinking about cutting out the Modal works cats for HJS or GESi cats.
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Old Jul 2, 2020 | 04:00 PM
  #107  
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Originally Posted by elitex
Lol, exactly. Brian, you saved me like $2k as I was thinking about cutting out the Modal works cats for HJS or GESi cats.
Yeah I really think the 2020 models are even more strict/sensitive. The cats are worth it still cause there is NO smell at all with mine and it should pass emissions still.

The mini cat spacers are installed and so far I have driven it twice and no CEL. If it doesn't come back in the next 2-3 days I'd say problem solved. Before spacers it came back on almost right away after clearing the CEL.
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Old Jul 2, 2020 | 04:06 PM
  #108  
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GESI cats have the OBD2 emission stamp and you will not get a CEL guaranteed.
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Old Jul 2, 2020 | 04:32 PM
  #109  
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Originally Posted by shardul
The whole point of getting catted downpipes is not to get a secondary O2 sensor code.
So you all are running catted downpipes and still chasing how to get ride of the CEL? Use quality high flows cats and you will not get a CEL.
yes we are catted and I was not hoping to get a cel either but what’s done is done, have you had any experience with these problems?
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Old Jul 2, 2020 | 04:35 PM
  #110  
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Originally Posted by BrianShaw23
Yeah I really think the 2020 models are even more strict/sensitive. The cats are worth it still cause there is NO smell at all with mine and it should pass emissions still.

The mini cat spacers are installed and so far I have driven it twice and no CEL. If it doesn't come back in the next 2-3 days I'd say problem solved. Before spacers it came back on almost right away after clearing the CEL.
what brand mini cat spacers did you go with?
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Old Jul 2, 2020 | 04:53 PM
  #111  
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Originally Posted by Nick_vazirani
what brand mini cat spacers did you go with?
I ordered these: http://www.bigdaddiesgarage.com/mini-cat-cel-fix.html

So far so good.
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Old Jul 2, 2020 | 05:15 PM
  #112  
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Originally Posted by Nick_vazirani
yes we are catted and I was not hoping to get a cel either but what’s done is done, have you had any experience with these problems?
Yes that is why if someone ask me for catted downpipes I only offer them with GESI UHF cats,
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Old Jul 2, 2020 | 05:32 PM
  #113  
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Originally Posted by BrianShaw23
did they take very long to deliver the spacers?
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Old Jul 2, 2020 | 06:38 PM
  #114  
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Originally Posted by Nick_vazirani
did they take very long to deliver the spacers?
No, arrived in a few days.
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Old Jul 2, 2020 | 06:57 PM
  #115  
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Originally Posted by BrianShaw23
No, arrived in a few days.
awesome I’m going to get them ordered thank you
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Old Jul 2, 2020 | 07:57 PM
  #116  
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Originally Posted by BrianShaw23
No, arrived in a few days.
just double checking to make sure that we have to order 2 of of them for our cars and not 1 as there’s 2 o2 senors one for each DP?
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Old Jul 3, 2020 | 12:56 AM
  #117  
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Originally Posted by elitex
Nice. let me know how it goes. I've been really busy with other stuff and haven't had a chance to do this.
Which spacers are you currently running and areyou still getting CEL?

Did Modal send you a different spacer?

I have a setof catted DP from Modal and debating on putting on spacers before dealing with CEL.
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Old Jul 3, 2020 | 01:03 AM
  #118  
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Originally Posted by Spazdoc
Which spacers are you currently running and areyou still getting CEL?

Did Modal send you a different spacer?

I have a setof catted DP from Modal and debating on putting on spacers before dealing with CEL.
Save yourself the trouble and just get spacers installed with your catted dps. Spacers won't hurt anything.

Last edited by BrianShaw23; Jul 3, 2020 at 01:05 AM.
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Old Jul 3, 2020 | 09:10 AM
  #119  
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Just had Armytrix catted downpipes installed on my 2019 C63s, still running Stage 1 tune, everything is good so far. I'd say the car sounds like pre facelift used to sound, just more crackles and pops. Initial thoughts that I probably wouldn't do it again, may be if it was half the price...
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Old Jul 3, 2020 | 09:19 AM
  #120  
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Originally Posted by NYCSoiL
Just had Armytrix catted downpipes installed on my 2019 C63s, still running Stage 1 tune, everything is good so far. I'd say the car sounds like pre facelift used to sound, just more crackles and pops. Initial thoughts that I probably wouldn't do it again, may be if it was half the price...
ModalWorks is about $1k less.
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Old Jul 3, 2020 | 09:20 AM
  #121  
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Originally Posted by elitex
ModalWorks is about $1k less.
Yeah, but questionable quality as far as I can see.
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Old Jul 3, 2020 | 09:22 AM
  #122  
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Originally Posted by NYCSoiL
Yeah, but questionable quality as far as I can see.
Yeah I guess time will tell. I can’t tell a difference between quality welds and bad ones.
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Old Jul 3, 2020 | 01:25 PM
  #123  
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Installed catted DPs and hell, I am so disappointed with the sound. It is nowhere near my rs6 and pre-facelift C/E63.

Utterly disappointed. Now I have to pay 6000$ to see if full exhaust would fix it. If that is not going to help - this is the first and the last Merc I ever owned.

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Old Jul 3, 2020 | 01:41 PM
  #124  
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Mine pops at rev. How many miles on your car? I guess it’s all about perspective. I knew it wouldn’t be as loud as my Shelby GT350 with resonators removed. You gotta really dig into the throttle and Ecu starts learning and pops and cracks gets louder and louder. Mine definitely became more lively after 5k plus miles.
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Old Jul 3, 2020 | 01:58 PM
  #125  
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The mini cat spacers did the job, I've driven the car over 300 miles over 4-5 separate drive cycles and no CEL. Before the spacers, the CEL came back on after about 50 miles after clearing the CEL.

This is what I ordered, they are smaller spacers than usual but if you have catted downpipes this should be more than enough: http://www.bigdaddiesgarage.com/mini-cat-cel-fix.html

The spacers fit well, the installer said the driver side cat was more difficult cause there was less room because of hosing/wires but they got it to fit on both sides. I'd imagine bigger normal size spacers would've been even more difficult. Order x2 of them obviously, one for each post cat sensor.
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