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Installing Downpipes this week- o2 Spacer?

     
Old 05-05-2024, 07:45 PM
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Installing Downpipes this week- o2 Spacer?
Getting ModalWorks catted Downpipes installed this week, and after plenty of investigating, I can't find a clear answer if o2 spacers are needed on Catted Downpipes?

Just want to make sure I'm doing this correctly as I would like to avoid a CEL, lmao.

Appreciate any feedback. Gracias!
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Old 05-05-2024, 08:05 PM
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2010 c300 4matic , 2005 c230 kompressor (totaled) , 97' honda civic, 2018 c63s coupe
Originally Posted by seabiscuit
Getting ModalWorks catted Downpipes installed this week, and after plenty of investigating, I can't find a clear answer if o2 spacers are needed on Catted Downpipes?

Just want to make sure I'm doing this correctly as I would like to avoid a CEL, lmao.

Appreciate any feedback. Gracias!

Your tuner can wipe the CEL for the o2. I have catless DPs so I wouldn’t sweat the CEL.
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Old 05-05-2024, 08:22 PM
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Unfortunately not getting it tuned :/
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Old 05-05-2024, 08:27 PM
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Originally Posted by seabiscuit
Unfortunately not getting it tuned :/
Ah ok, hopefully someone can chime in here GL
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Old 05-06-2024, 04:44 AM
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Mine came with mini cats-no cel on stock tune
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Old 05-06-2024, 06:41 PM
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Originally Posted by gforc3
Mine came with mini cats-no cel on stock tune
That's what I can't really find- if they are catted, do you really need Spacers?
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Old 05-06-2024, 11:52 PM
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Originally Posted by slowc
Your tuner can wipe the CEL for the o2. I have catless DPs so I wouldn’t sweat the CEL.
The car will still fail emissions in any state that checks for o2 readiness.


Originally Posted by seabiscuit
That's what I can't really find- if they are catted, do you really need Spacers?
If the catted DP's come with an extended secondary o2 bung then I dont see a CEL popping up. Its the secondary o2 sensor that triggers the CEL.
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Old 05-07-2024, 12:29 PM
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That's what I needed to know- thank you!
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Old 05-26-2024, 12:32 PM
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Thinking about doing these soon also, but with a tune. Did your car throw a cel light?
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Old 05-26-2024, 08:27 PM
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Originally Posted by buffalosojah
Thinking about doing these soon also, but with a tune. Did your car throw a cel light?
If you are getting a tune then no need to worry about CEL. DP without tune will 100% throw a CEL and DP with O2 spacers is honestly a gamble, some people still get them some don't
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Old 05-27-2024, 12:46 PM
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Mercedes ECUs are too smart for 02 spacers; hell, my 2005 C55 threw codes with upgraded DPs. I had to get it tuned out by the manufacturer (Kleemann).
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Old 05-27-2024, 12:55 PM
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If the tuner turns offs the light, doesn't it still fail plug in emissions? That's my concern.
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Old 05-27-2024, 10:38 PM
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Originally Posted by buffalosojah
If the tuner turns offs the light, doesn't it still fail plug in emissions? That's my concern.
If your state or county checks for O2 readiness, your car will still fail.
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Old 05-28-2024, 05:06 PM
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Originally Posted by buffalosojah
Thinking about doing these soon also, but with a tune. Did your car throw a cel light?
Yep, have a CEL. Sucks, but the sound is crazy good. lol.
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Old 05-28-2024, 05:07 PM
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Originally Posted by raphman
Mercedes ECUs are too smart for 02 spacers; hell, my 2005 C55 threw codes with upgraded DPs. I had to get it tuned out by the manufacturer (Kleemann).
Makes sense. Not even going to mess with getting Spacers. Just going to ride out the CEL.
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Old 05-28-2024, 11:49 PM
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Big daddies garage Mini cat spacer is the only O2 spacer that would work. I almost went with the modalworks/o2 spacer combo but I ended up getting the 200cell HJS catted redstar pipes. No spacers needed and no CEL! Expensive but I didn't want to mess with spacers or a tune. Very quality pipes.
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Old 05-29-2024, 06:47 AM
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Originally Posted by Aliw140
Big daddies garage Mini cat spacer is the only O2 spacer that would work. I almost went with the modalworks/o2 spacer combo but I ended up getting the 200cell HJS catted redstar pipes. No spacers needed and no CEL! Expensive but I didn't want to mess with spacers or a tune. Very quality pipes.
Any idea how much power your car picked up with these?
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