1M has high flow cats in downpipe??? - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)

Gtrain · 07-31-2012, 05:32 PM

Does the 1M have high flow cats in the downpipes?
I have read elsewhere that the 1M had high flow cats but was wondering if there was any data to back that up.

From looking at realoem, the 1M cats versus the 135 n54 cats, they have different part numbers for sure.

1M
01 Rmfd primary catalytic converter ZYL. 1-3 1 18307980403
02 Rmfd primary catalytic converter ZYL. 4-6 1 18307980404

135 N54 Engine
01 Rmfd primary catalytic converter ZYL. 1-3 1 18307553594 $957.00
02 Rmfd primary catalytic converter ZYL. 4-6 1 18307553595 $957.00

Dackelone · 07-31-2012, 06:23 PM

Yes, the 1M has higher flow cats - so it has been reported before.

MDORPHN · 07-31-2012, 07:22 PM

And it's interesting that there was not even a whisper of this difference during all of pre-production hype generated by BMW, while other suggested differences (piston rings, etc) proved not to be.

Neil

p66 · 07-31-2012, 08:46 PM

A tuner shop dyno'd the AR dp's with race cats and generated insignificant gains over stock. With and without a tune. Would support the evidence that 1M has higher flow cats than 135i.

Don't ask me for graphs, or names, places and dates. I don't have them. I was considering getting the AR's and was advised to save my money. Coming from the tuner himself, that sells the product, made an impression on me.

OrangeCrush · 07-31-2012, 09:42 PM

I have smelled the non cat/ high flow cat smell on numerous occasions. I have also heard this and though it was caused by this. Either that or my car is fucked up.

OrangeCrush · 07-31-2012, 09:44 PM

Quote:

Originally Posted by p66

A tuner shop dyno'd the AR dp's with race cats and generated insignificant gains over stock. With and without a tune. Would support the evidence that 1M has higher flow cats than 135i.

Don't ask me for graphs, or names, places and dates. I don't have them. I was considering getting the AR's and was advised to save my money. Coming from the tuner himself, that sells the product, made an impression on me.

I think it was GIAC, they said we didn't need to update the downpipes for one of thier more aggressive tunes because of the highflow cats of the 1m

Zuzu · 07-31-2012, 09:49 PM

Quote:

Originally Posted by Gtrain

Does the 1M have high flow cats in the downpipes?
I have read elsewhere that the 1M had high flow cats but was wondering if there was any data to back that up.

From looking at realoem, the 1M cats versus the 135 n54 cats, they have different part numbers for sure.

1M
01 Rmfd primary catalytic converter ZYL. 1-3 1 18307980403
02 Rmfd primary catalytic converter ZYL. 4-6 1 18307980404

135 N54 Engine
01 Rmfd primary catalytic converter ZYL. 1-3 1 18307553594 $957.00
02 Rmfd primary catalytic converter ZYL. 4-6 1 18307553595 $957.00

Its here..

http://www.1addicts.com/forums/showthread.php?t=691143

and here..

http://www.1addicts.com/forums/showthread.php?t=702209

Gtrain · 08-01-2012, 09:15 AM

Thanks for all the info. I was wondering if there were any hard facts on this, that's all.

Thanks again

flzrider · 08-01-2012, 11:16 AM

Never knew this. Learned something today.

Rich@GTBPerformance · 08-01-2012, 12:54 PM

Good stuff to know! I guess I know why I haven't sold a set to a 1M driver yet!

1Mpressive · 08-09-2012, 09:53 AM

Good info! a

Not to thread jack but i had a question for those with Akrapovic... Do you get the same or similar sound as heard on the Alekshop Akra video without the aftermarket cats? More specific do you hear the turbo spool up like in the video with the factory cats and say the akrapovic mid and rear sections? ...with wireless of course

bdaddylo · 08-09-2012, 10:15 AM

In order to hear the turbos spool up on any exhaust, you have to go catless.

-Z- · 08-12-2012, 09:44 AM

Quote:

Originally Posted by bdaddylo

In order to hear the turbos spool up on any exhaust, you have to go catless.

in many cases it also means raspy sound I hate... and gas smell.

MDORPHN · 08-12-2012, 11:02 AM

I had the opportunity to to a side-by-side comparison of 1M downpipes and other N54 downpipes this weekend.

Other than different numbers etched into the cat, externally they are identical. And no difference was obvious looking through the pipe at the cat substrate.

However, we put them on a scale and the 1M cats weighed less than the other (7.6 lbs v 8.0 lbs).

This difference may be related to the much higher mileage of the "regular" N54 downpipe or it may be the the 1M cat substrate is less dense and, for that reason, higher flowing. I'm guessing it's the latter.

Neil

sparoz · 08-12-2012, 08:00 PM

Quote:

Originally Posted by MDORPHN

I had the opportunity to to a side-by-side comparison of 1M downpipes and other N54 downpipes this weekend.

Other than different numbers etched into the cat, externally they are identical. And no difference was obvious looking through the pipe at the cat substrate.

However, we put them on a scale and the 1M cats weighed less than the other (7.6 lbs v 8.0 lbs).

This difference may be related to the much higher mileage of the "regular" N54 downpipe or it may be the the 1M cat substrate is less dense and, for that reason, higher flowing. I'm guessing it's the latter.

Neil

Thanks, that's good information. Advan in Sydney has confirmed that too. However, GIAC's work indicate that it is higher flow.

PunjabiM3 · 08-13-2012, 12:26 PM

Good info! Any figures for how much catless DP's would add power wise with tune over the stock DP's?

ADVANT123 · 08-13-2012, 03:30 PM

So if the 1M has higher flowing cats, does this mean we can run the Cobb Stage II/Stage II+ mods if we have all the other mods?

ozinaldo · 08-15-2012, 05:40 AM

Quote:

Originally Posted by ADVANT123

So if the 1M has higher flowing cats, does this mean we can run the Cobb Stage II/Stage II+ mods if we have all the other mods?

GIAC was saying that stock DPs are enough (though a catless alternative would be the better solution) for their Stage 2 tune so should be others.

HP Autowerks · 08-17-2012, 03:29 PM

We only saw 8-12 whp with high flow cats vs stock.

07-31-2012, 05:32 PM	#1
Gtrain Lieutenant Colonel Drives: something slowwwww Join Date: Mar 2006 Location: NYC Posts: 1,888 iTrader: (20)	1M has high flow cats in downpipe??? Does the 1M have high flow cats in the downpipes? I have read elsewhere that the 1M had high flow cats but was wondering if there was any data to back that up. From looking at realoem, the 1M cats versus the 135 n54 cats, they have different part numbers for sure. 1M 01 Rmfd primary catalytic converter ZYL. 1-3 1 18307980403 02 Rmfd primary catalytic converter ZYL. 4-6 1 18307980404 135 N54 Engine 01 Rmfd primary catalytic converter ZYL. 1-3 1 18307553594 $957.00 02 Rmfd primary catalytic converter ZYL. 4-6 1 18307553595 $957.00
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07-31-2012, 06:23 PM	#2
Dackelone Moderator Drives: 135i Silber mit/Rot 6MT N54 Join Date: Feb 2010 Location: Bayern, Germany Posts: 13,016 iTrader: (0)	Yes, the 1M has higher flow cats - so it has been reported before. __________________ Dackel's European Delivery Museum Guide 1addicts at Stelv1oPass

08-01-2012, 11:16 AM	#9
flzrider Lieutenant Drives: AW 1M Join Date: Oct 2005 Location: Miami/Gainesville, FL Posts: 515 iTrader: (1)	Never knew this. Learned something today. __________________

08-01-2012, 12:54 PM	#10
Rich@GTBPerformance Bimmerpost Gold Supporting Vendor Drives: A hard bargain Join Date: Dec 2010 Location: Northern NJ Posts: 6,423 iTrader: (4)	Good stuff to know! I guess I know why I haven't sold a set to a 1M driver yet! __________________ Your Home For Premium BMW Aftermarket Parts www.gtbperformance.com \| sales@gtbperformance.com \| Facebook \| 973 429 2839

08-09-2012, 10:15 AM	#12
bdaddylo Captain Drives: 2011 E82 1M Join Date: Dec 2010 Location: Houston, TX Posts: 820 iTrader: (0) Garage List 2005 Acura MDX [0.00] 2011 BMW 1 Series M ... [0.00]	In order to hear the turbos spool up on any exhaust, you have to go catless. __________________ _______________________ 2011 1 Series M Coupe/VO/Convenience Pkg/Premium Pkg/Harman Kardon/AFE Scoops/Berk Midpipes/P3 V2/BMS Catch Can/CF Rear Deck Spoiler/3M Clear Bra/3M Crystalline/Homelink/M Performance Steering Wheel

07-31-2012, 07:22 PM	#3
MDORPHN Lieutenant Colonel Drives: AW 1M Join Date: Oct 2010 Location: Wash, DC Posts: 1,771 iTrader: (0)	And it's interesting that there was not even a whisper of this difference during all of pre-production hype generated by BMW, while other suggested differences (piston rings, etc) proved not to be. Neil

07-31-2012, 08:46 PM	#4
p66 Private First Class Drives: 1M Join Date: May 2011 Location: Dallas, Texas Posts: 157 iTrader: (0)	A tuner shop dyno'd the AR dp's with race cats and generated insignificant gains over stock. With and without a tune. Would support the evidence that 1M has higher flow cats than 135i. Don't ask me for graphs, or names, places and dates. I don't have them. I was considering getting the AR's and was advised to save my money. Coming from the tuner himself, that sells the product, made an impression on me.

07-31-2012, 09:42 PM	#5
OrangeCrush Private First Class Drives: VO 1M #513/740 Join Date: May 2012 Location: USA Posts: 170 iTrader: (0)	I have smelled the non cat/ high flow cat smell on numerous occasions. I have also heard this and though it was caused by this. Either that or my car is fucked up.

08-01-2012, 09:15 AM	#8
Gtrain Lieutenant Colonel Drives: something slowwwww Join Date: Mar 2006 Location: NYC Posts: 1,888 iTrader: (20)	Thanks for all the info. I was wondering if there were any hard facts on this, that's all. Thanks again

08-09-2012, 09:53 AM	#11
1Mpressive New Member Drives: 2011 1M Join Date: Dec 2011 Location: SoCal Posts: 25 iTrader: (0)	Good info! a Not to thread jack but i had a question for those with Akrapovic... Do you get the same or similar sound as heard on the Alekshop Akra video without the aftermarket cats? More specific do you hear the turbo spool up like in the video with the factory cats and say the akrapovic mid and rear sections? ...with wireless of course

08-12-2012, 11:02 AM	#14
MDORPHN Lieutenant Colonel Drives: AW 1M Join Date: Oct 2010 Location: Wash, DC Posts: 1,771 iTrader: (0)	I had the opportunity to to a side-by-side comparison of 1M downpipes and other N54 downpipes this weekend. Other than different numbers etched into the cat, externally they are identical. And no difference was obvious looking through the pipe at the cat substrate. However, we put them on a scale and the 1M cats weighed less than the other (7.6 lbs v 8.0 lbs). This difference may be related to the much higher mileage of the "regular" N54 downpipe or it may be the the 1M cat substrate is less dense and, for that reason, higher flowing. I'm guessing it's the latter. Neil

08-13-2012, 12:26 PM	#16
PunjabiM3 Lieutenant Colonel Drives: VO 1M Join Date: Mar 2008 Location: Tucson, AZ Posts: 1,673 iTrader: (1)	Good info! Any figures for how much catless DP's would add power wise with tune over the stock DP's? __________________ New ride ETA 2 weeks 2012 Audi A6 Prestige, Moonlight Blue 2009 Lexus ES350, Sparkling Graphite (wife's) Previous: 11 e82 1M, 07 997TT, 08 e92 M3, 06 997 C2S, 05 e46 M3 coupe, 03.5 e46 M3 cabrio

08-13-2012, 03:30 PM	#17
ADVANT123 Second Lieutenant Drives: 1M Join Date: Jul 2009 Location: NJ Posts: 260 iTrader: (0)	So if the 1M has higher flowing cats, does this mean we can run the Cobb Stage II/Stage II+ mods if we have all the other mods? __________________ 2011 Valencia Orange 1M - Weekend Warrior 2013 Acura RDX - Daily

08-17-2012, 03:29 PM	#19
HP Autowerks Lieutenant General Drives: 2011 135i DCT & 2011 1M Join Date: Mar 2007 Location: Santa Barbara, AST, Brembo, Eibach, H&R, GIAC, Koni, Quaife, Stoptech, Vorshlag, Posts: 10,048 iTrader: (26)	We only saw 8-12 whp with high flow cats vs stock.

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