Cell Count on Cats in OEM DP?

hlm2c · 12-24-2019, 07:30 AM

Been trying to look for the info, including searching M3/M4 forums, however haven't seen anything official, just speculation. But does anyone know the cell count on stock DP cats on the M2C? Not sure as well if there's a difference in cell count when it comes to US vs. EU cats (someone had mentioned this might be the case on M3/M4 forums due to the difference in emission standards). Lastly, is it worth it going from stock DPs to high flow DPs (for the individuals that don't want to go catless)? M3/M4 forums mentioned that OEM cats flows pretty well already, so debating whether it's worth it for the money to switch from OEM to aftermarket high flow cats.

mike@x-ph.com · 12-24-2019, 10:30 AM

Quote:

Originally Posted by hlm2c

Been trying to look for the info, including searching M3/M4 forums, however haven't seen anything official, just speculation. But does anyone know the cell count on stock DP cats on the M2C? Not sure as well if there's a difference in cell count when it comes to US vs. EU cats (someone had mentioned this might be the case on M3/M4 forums due to the difference in emission standards). Lastly, is it worth it going from stock DPs to high flow DPs (for the individuals that don't want to go catless)? M3/M4 forums mentioned that OEM cats flows pretty well already, so debating whether it's worth it for the money to switch from OEM to aftermarket high flow cats.

I dont have any official info on the CEL count for stock cats.

If you are tuning your car, upgrading the downpipe is worth it

CSL335i · 12-24-2019, 10:55 AM

Quote:

Originally Posted by hlm2c

Been trying to look for the info, including searching M3/M4 forums, however haven't seen anything official, just speculation. But does anyone know the cell count on stock DP cats on the M2C? Not sure as well if there's a difference in cell count when it comes to US vs. EU cats (someone had mentioned this might be the case on M3/M4 forums due to the difference in emission standards). Lastly, is it worth it going from stock DPs to high flow DPs (for the individuals that don't want to go catless)? M3/M4 forums mentioned that OEM cats flows pretty well already, so debating whether it's worth it for the money to switch from OEM to aftermarket high flow cats.

EU spec DP has 400 cell cats i assume

S55bruh · 12-25-2019, 12:30 PM

I was considering these: https://www.lightweight-titanauspuff...mpetition.html

Pretty expensive though.

AndrewC1989 · 12-25-2019, 02:32 PM

The N55 M2 only has one primary cat and it is 600 cell. With US-spec M2C's I believe they have two 400 cell primaries and two 200 cell secondaries. This may be wrong, however, so don't quote me on that.

In the EU it gets more complicated as they have OPFs instead of secondaries. I'm not sure how the OPFs affect total cell count but I would assume they raise it.

If you have a car without OPF I absolutely think HFC's would be worthwhile as you get less lag and more sound, usually without a CEL, smoke, or smells. The only downside is the price.

If you have an OPF car however, I would advise you to do some research before pulling the trigger as there may be adverse effects such as a CEL and/or damage to the OPF.

I think a good person to ask about this would be @MR.

He made a great post explaining M2C exhausts and OPF's: https://f87.bimmerpost.com/forums/sh...9#post25263099

andrewoc92 · 12-29-2019, 11:15 AM

Quote:

Originally Posted by hlm2c

Been trying to look for the info, including searching M3/M4 forums, however haven't seen anything official, just speculation. But does anyone know the cell count on stock DP cats on the M2C? Not sure as well if there's a difference in cell count when it comes to US vs. EU cats (someone had mentioned this might be the case on M3/M4 forums due to the difference in emission standards). Lastly, is it worth it going from stock DPs to high flow DPs (for the individuals that don't want to go catless)? M3/M4 forums mentioned that OEM cats flows pretty well already, so debating whether it's worth it for the money to switch from OEM to aftermarket high flow cats.

I personally have AR Downpipes high flow catted in my m2c and love them. No check engine light and definitely brings a nice tone to it. Not to loud but just right

Fahidm2comp · 12-30-2019, 04:55 AM

Quote:

Originally Posted by andrewoc92

I personally have AR Downpipes high flow catted in my m2c and love them. No check engine light and definitely brings a nice tone to it. Not to loud but just right

How was the fitment? Was looking to pull the trigger on the resonated version for when I go to stage 2...

andrewoc92 · 12-30-2019, 05:21 AM

Quote:

Originally Posted by Fahidm2comp

Quote:

Originally Posted by andrewoc92

I personally have AR Downpipes high flow catted in my m2c and love them. No check engine light and definitely brings a nice tone to it. Not to loud but just right

How was the fitment? Was looking to pull the trigger on the resonated version for when I go to stage 2...

Fitment was perfect, not a single issue

SEAT TIME RULES · 12-30-2019, 03:41 PM

Quote:

Originally Posted by andrewoc92

I personally have AR Downpipes high flow catted in my m2c and love them. No check engine light and definitely brings a nice tone to it. Not to loud but just right

Did you have it tuned after the HFC install?

Impressions of before vs after?

I'm looking to run a set of these as well....

andrewoc92 · 12-30-2019, 04:03 PM

Quote:

Originally Posted by SEAT TIME RULES

Quote:

Originally Posted by andrewoc92

I personally have AR Downpipes high flow catted in my m2c and love them. No check engine light and definitely brings a nice tone to it. Not to loud but just right

Did you have it tuned after the HFC install?

Impressions of before vs after?

I'm looking to run a set of these as well....

Quote:

Originally Posted by SEAT TIME RULES

Quote:

Originally Posted by andrewoc92

I personally have AR Downpipes high flow catted in my m2c and love them. No check engine light and definitely brings a nice tone to it. Not to loud but just right

Did you have it tuned after the HFC install?

Impressions of before vs after?

I'm looking to run a set of these as well....

So I am still bone stock when it comes to tuning, the hfc definitely made the car more audible, not as much as catless but definitely a nice tone for what it is. I have been running these for about a month with no issues. I daily drive the car. If anybody is interested in a video clip shoot me a pm and I'll send my number over. But keep in mind, video quality usually does not do the justice

SEAT TIME RULES · 12-30-2019, 06:32 PM

Quote:

Originally Posted by andrewoc92

So I am still bone stock when it comes to tuning, the hfc definitely made the car more audible, not as much as catless but definitely a nice tone for what it is. I have been running these for about a month with no issues. I daily drive the car. If anybody is interested in a video clip shoot me a pm and I'll send my number over. But keep in mind, video quality usually does not do the justice

THX...How about power? Can you feel measurable TQ?

andrewoc92 · 12-30-2019, 06:34 PM

Quote:

Originally Posted by SEAT TIME RULES

Quote:

Originally Posted by andrewoc92

So I am still bone stock when it comes to tuning, the hfc definitely made the car more audible, not as much as catless but definitely a nice tone for what it is. I have been running these for about a month with no issues. I daily drive the car. If anybody is interested in a video clip shoot me a pm and I'll send my number over. But keep in mind, video quality usually does not do the justice

THX...How about power? Can you feel measurable TQ?

You can definitely feel the exhaust breathe better. But as far as hp gains, nothing out of the ordinary or noticeable. Once tuned I am sure you'll feel something but this is a nice thing to have if you're not tuning just to make it slightly louder

hlm2c · 12-31-2019, 05:14 AM

Quote:

Originally Posted by andrewoc92

You can definitely feel the exhaust breathe better. But as far as hp gains, nothing out of the ordinary or noticeable. Once tuned I am sure you'll feel something but this is a nice thing to have if you're not tuning just to make it slightly louder

Are you stock mid and axelback?

andrewoc92 · 12-31-2019, 05:17 AM

Quote:

Originally Posted by hlm2c

Quote:

Originally Posted by andrewoc92

You can definitely feel the exhaust breathe better. But as far as hp gains, nothing out of the ordinary or noticeable. Once tuned I am sure you'll feel something but this is a nice thing to have if you're not tuning just to make it slightly louder

Are you stock mid and axelback?

Yes

12-24-2019, 07:30 AM	#1
hlm2c Lieutenant 290 Rep 408 Posts Drives: M2C Join Date: Dec 2018 Location: US/Korea iTrader: (1)	Cell Count on Cats in OEM DP? Been trying to look for the info, including searching M3/M4 forums, however haven't seen anything official, just speculation. But does anyone know the cell count on stock DP cats on the M2C? Not sure as well if there's a difference in cell count when it comes to US vs. EU cats (someone had mentioned this might be the case on M3/M4 forums due to the difference in emission standards). Lastly, is it worth it going from stock DPs to high flow DPs (for the individuals that don't want to go catless)? M3/M4 forums mentioned that OEM cats flows pretty well already, so debating whether it's worth it for the money to switch from OEM to aftermarket high flow cats.
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12-25-2019, 12:30 PM	#4
S55bruh Private 74 Rep 67 Posts Drives: Alpine White Join Date: Sep 2018 Location: Deep South iTrader: (0)	I was considering these: https://www.lightweight-titanauspuff...mpetition.html Pretty expensive though.
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12-25-2019, 02:32 PM	#5
AndrewC1989 Brigadier General 10918 Rep 4,550 Posts Drives: 2015 328d xDrive Join Date: Aug 2010 Location: NoVA iTrader: (5) Garage List 2015 328d xDrive [8.90]	The N55 M2 only has one primary cat and it is 600 cell. With US-spec M2C's I believe they have two 400 cell primaries and two 200 cell secondaries. This may be wrong, however, so don't quote me on that. In the EU it gets more complicated as they have OPFs instead of secondaries. I'm not sure how the OPFs affect total cell count but I would assume they raise it. If you have a car without OPF I absolutely think HFC's would be worthwhile as you get less lag and more sound, usually without a CEL, smoke, or smells. The only downside is the price. If you have an OPF car however, I would advise you to do some research before pulling the trigger as there may be adverse effects such as a CEL and/or damage to the OPF. I think a good person to ask about this would be @MR. He made a great post explaining M2C exhausts and OPF's: https://f87.bimmerpost.com/forums/sh...9#post25263099
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