Cel free Catless downpipe. Stock/Help!!

Zito · 11-15-2017, 12:24 PM

Hi Guys!

Is it possible to stay cel free with catless downpipe. I Dont want to tune the car.

Plz help!

LBBDrew · 11-15-2017, 01:11 PM

Not reliably. Get a high flow catted DP.

alexc93 · 11-15-2017, 04:47 PM

Not likely. Can always run JB4 on Map 0.

No Boost · 11-15-2017, 05:17 PM

Every catless dp will eventually throw a cel.

Hasan Shaikh · 11-16-2017, 01:30 AM

Just put a spacer in front of your post cat O2 sensors and you will not get the CEL.

Hasan Shaikh · 11-19-2017, 12:03 AM

Quote:

Originally Posted by brooke1972

Has this been proven or theory?

There is nothing theoretical about it. It has been working since manufacturers started putting cats in the cars and has 100% success rate.

Hasan Shaikh · 11-19-2017, 06:23 AM

Buddy. There is no need to loose your temper and shout. It works on any car, so I don't see any reason why it would not work on the M2.

If it has not been done on an M2 yet, now is your chance to be the first one.

Hasan Shaikh · 11-19-2017, 06:43 AM

Try this one

http://www.fabspeed.com/universal-o2...tic-converter/

AndrewC1989 · 11-19-2017, 09:38 AM

if you don't want to tune the car and don't want a CEL then buy a sport cat. end of story.

stefan · 11-19-2017, 05:58 PM

Quote:

Originally Posted by brooke1972

Has this been proven or theory?

Don't bother. You have to get so lucky in terms of how lean the ratio gets because of the spacer and chances are the OBD2 system is logging all kinds of emissions errors prior to an actual CEL. It might work for a bit but it's only a matter of time until you get a code using this method. I'm speaking from experience on an e36 m3 and e39 m5 and trust me you will be fiddling forever. With the E36 I just installed a bypass circuit purchased from bimmerforums and the E39 M5 I ended up installing hiflow cats.

Hasan Shaikh · 11-20-2017, 02:27 AM

Quote:

Originally Posted by stefan

Don't bother. You have to get so lucky in terms of how lean the ratio gets because of the spacer and chances are the OBD2 system is logging all kinds of emissions errors prior to an actual CEL. It might work for a bit but it's only a matter of time until you get a code using this method. I'm speaking from experience on an e36 m3 and e39 m5 and trust me you will be fiddling forever. With the E36 I just installed a bypass circuit purchased from bimmerforums and the E39 M5 I ended up installing hiflow cats.

I have had these on my E36 M3 and E63 M6 for some years now without any issues or a CEL. Installed once and never had to do anything.

AK.Alexx · 11-20-2017, 04:07 AM

I also used Hasan's method on my M135i.
In 3 years, I had 2-3 times a CEL. But it disapeared after a time. Good solution if you don't want to tune. Friend of mine use it on hes 996 Turbo and Megane RS. No problem.

dcmac · 11-23-2017, 03:21 PM

What’s your reason for not wanting the tune? If you’re goin catless with the DP why not go all the way?

AndrewC1989 · 11-23-2017, 04:06 PM

Quote:

Originally Posted by dcmac

What’s your reason for not wanting the tune?

Warranty

kab_m2 · 11-25-2017, 04:53 AM

Quote:

Originally Posted by andrewc89

Quote:

Originally Posted by dcmac

What’s your reason for not wanting the tune?

Warranty

Catless dp voids your drivetrain warranty

AndrewC1989 · 11-25-2017, 08:03 AM

Quote:

Originally Posted by kab_m2

Catless dp voids your drivetrain warranty

really? since when? i've brought in cars without cats for service at the dealer and never had issues or been told that. also even if that were the case you can take a dp off before service, replace it with the stock one and be fine.

Evidence of a tune would be logged in the DME and you'd be screwed regardless.

kab_m2 · 11-25-2017, 03:13 PM

Quote:

Originally Posted by andrewc89

Quote:

Originally Posted by kab_m2

Catless dp voids your drivetrain warranty

really? since when? i've brought in cars without cats for service at the dealer and never had issues or been told that. also even if that were the case you can take a dp off before service, replace it with the stock one and be fine.

Evidence a tune would be logged in the DME and you'd be screwed regardless.

If something went wrong and they knew about it then it would be an easy thing to point the finger at

You can't expect to change such a critical component of the car and BMW not pull you up on it. I mean the car is throwing a cel! That's indication enough that you've made a change that puts the car outside of engine oem specs

To be honest I'm just playing devils advocate here. I've never heard of a warranty being denied because of a dp but I have heard plenty of times from dealers that changing it would have warranty consequences

mike@x-ph.com · 12-04-2017, 05:24 PM

Get the Fabspeed or Wagner catted downpipe instead.
Power gains are going to be the same with high flow cats vs catless on stock car

963mw · 12-05-2017, 06:43 AM

This might be a long run, but I am yet to see one car with a CEL due to a Catless DP in Lebanon. I didn't get one on my 435i, one of my friends with a 435i also didn't get one, both my friends with M2's also didn't get one.

I believe it has something to do with the "Levant package" that shows up on E-Sys for all cars. I believe this stops all warnings related to emissions due to the somewhat dodgy fuel quality in Lebanon.

All US imported cars get CEL from the gas, so I guess this was BMW's remedy for the region.

Check out if you can code it.

11-15-2017, 12:24 PM	#1
Zito New Member 7 Rep 20 Posts Drives: BMW M550i Join Date: May 2017 Location: Sweden iTrader: (0)	Cel free Catless downpipe. Stock/Help!! Hi Guys! Is it possible to stay cel free with catless downpipe. I Dont want to tune the car. Plz help!
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11-15-2017, 01:11 PM	#2
LBBDrew Lieutenant 336 Rep 522 Posts Drives: 2017 LBB M2 Join Date: Feb 2016 Location: San Francisco iTrader: (0)	Not reliably. Get a high flow catted DP.
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11-15-2017, 04:47 PM	#3
alexc93 Colonel 381 Rep 2,384 Posts Drives: na Join Date: Nov 2009 Location: na iTrader: (8)	Not likely. Can always run JB4 on Map 0.
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11-15-2017, 05:17 PM	#4
No Boost enthusiasm > practicality 4021 Rep 2,247 Posts Drives: 987 CS \| G35x Join Date: Oct 2016 Location: Chester County, PA iTrader: (0) Garage List 2007 987.1 Cayman S [10.00] 2008 Infiniti G35x ... [0.00]	Every catless dp will eventually throw a cel. __________________ FSI 3.8L Stg II\|6MT\|SOUL\|IPD+GT3 TB\|Numeric Racing\|KW\|Tarett\|Rennline\|Raceseng\|APEX\|Recaro\|7.3 lb/hp VQ35HR\|5AT\|Stillen\|FI\|UpRev tune 8k rpm\|TransGo\|Hotchkis\|Whiteline\|H&R\|Z1\|Corbeau\|R1 Concepts\|10 lb/hp Left lane campers, GTFO!
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11-16-2017, 01:30 AM	#5
Hasan Shaikh Private First Class 24 Rep 104 Posts Drives: E63 M6, E36 M3 EVO (Euro Spec) Join Date: Sep 2017 Location: UAE iTrader: (0)	Just put a spacer in front of your post cat O2 sensors and you will not get the CEL.
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11-19-2017, 06:23 AM	#7
Hasan Shaikh Private First Class 24 Rep 104 Posts Drives: E63 M6, E36 M3 EVO (Euro Spec) Join Date: Sep 2017 Location: UAE iTrader: (0)	Buddy. There is no need to loose your temper and shout. It works on any car, so I don't see any reason why it would not work on the M2. If it has not been done on an M2 yet, now is your chance to be the first one.
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11-19-2017, 06:43 AM	#8
Hasan Shaikh Private First Class 24 Rep 104 Posts Drives: E63 M6, E36 M3 EVO (Euro Spec) Join Date: Sep 2017 Location: UAE iTrader: (0)	Try this one http://www.fabspeed.com/universal-o2...tic-converter/
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11-19-2017, 09:38 AM	#9
AndrewC1989 Brigadier General 10911 Rep 4,541 Posts Drives: 2015 328d xDrive Join Date: Aug 2010 Location: NoVA iTrader: (5) Garage List 2015 328d xDrive [8.75]	if you don't want to tune the car and don't want a CEL then buy a sport cat. end of story.
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11-20-2017, 04:07 AM	#12
AK.Alexx Private First Class 49 Rep 111 Posts Drives: BMW M2 on order Join Date: Feb 2014 Location: BELGIUM iTrader: (0)	I also used Hasan's method on my M135i. In 3 years, I had 2-3 times a CEL. But it disapeared after a time. Good solution if you don't want to tune. Friend of mine use it on hes 996 Turbo and Megane RS. No problem.
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11-23-2017, 03:21 PM	#13
dcmac Lieutenant 439 Rep 468 Posts Drives: '18 LCI M2 Join Date: Nov 2016 Location: Denver, CO iTrader: (0)	What’s your reason for not wanting the tune? If you’re goin catless with the DP why not go all the way?
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12-04-2017, 05:24 PM	#18
mike@x-ph.com BimmerPost Supporting Vendor 24093 Rep 190,630 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Get the Fabspeed or Wagner catted downpipe instead. Power gains are going to be the same with high flow cats vs catless on stock car __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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12-05-2017, 06:43 AM	#19
963mw BMW Fanatic 331 Rep 1,076 Posts Drives: M2 Join Date: Nov 2014 Location: Mexico iTrader: (0)	This might be a long run, but I am yet to see one car with a CEL due to a Catless DP in Lebanon. I didn't get one on my 435i, one of my friends with a 435i also didn't get one, both my friends with M2's also didn't get one. I believe it has something to do with the "Levant package" that shows up on E-Sys for all cars. I believe this stops all warnings related to emissions due to the somewhat dodgy fuel quality in Lebanon. All US imported cars get CEL from the gas, so I guess this was BMW's remedy for the region. Check out if you can code it. __________________ 18 BMW M2 \| ER DP \| ER CP \| Wagner Evo 2 Comp Intercooler \| Aquamist HFS4 \| BM3 \| CSF Oil Cooler \| AFE Drop-in Filter \| Bilstein B16 PSS10
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