Catless downpipes - New 2009 2010 BMW Z4

The_Hulk · 06-09-2012, 06:08 AM

I need help again from the more knowledgeable members.
I'm wanting to buy some AR design downpipes but am worried that the catless option will have high emissions.
The car must pass UK emissions test (MOT) when it's due and I'm not sure if this is possible with catless DP's.
Does anybody know if it will fail the MOT with the second cats in place? or if there will be a big diffrence in emissions?
Please help!

Vintage · 06-10-2012, 02:21 PM

You can order them with Race Cats from AR, that is what I am doing just to make sure the car does not trip any codes.

The_Hulk · 06-11-2012, 05:00 AM

Quote:

Originally Posted by VintageBMW

You can order them with Race Cats from AR, that is what I am doing just to make sure the car does not trip any codes.

I have been told today by a UK tuner that catless DP's have passed MOT test on 335i with secondary cats in place.
So should be ok on my Z
Don't want to go with race cats as you get less power and less sound.

Swallowbarn · 07-16-2012, 03:15 AM

Any updates?

fre2bpowerless · 07-18-2012, 04:46 AM

I ordered the catless but then switched to race cats for the same reason - pass emissions, avoid smell, not trip codes.

///MIKE · 07-18-2012, 11:29 AM

What sort of gains are we looking at here?

Vintage · 07-19-2012, 10:08 AM

they look great

z4z4z4 · 07-20-2012, 06:07 PM

:bow :
Racecats for e89....soOOOooo cool Vintage!

Vintage · 07-22-2012, 08:47 AM

Quote:

Originally Posted by z4z4z4

:bow :
Racecats for e89....soOOOooo cool Vintage!

thanks - they are on the car now but I have not picked it up from the shop yet as I am out of town on business for the week

z4z4z4 · 07-23-2012, 02:58 PM

Quote:

Originally Posted by ///MIKE

What sort of gains are we looking at here?

Other N54 downpipe manufacturers claim dyno results with
Gains up to 20hp and 30tq to the wheels.

theART · 10-19-2012, 02:53 PM

Do these trip engine code often on Z4? Also any one has dyno A/F readout to see if they pull fuel way back on stock ECU?

The_Hulk · 10-20-2012, 10:44 AM

Catted DP's won't trip any codes, the DP's work better with a tune or i wouldn't bother.

Toink · 01-08-2013, 01:53 AM

Any live material available on a regular 35is, 35is catless DP and 35is dp with racecats?

I'm making up my mind on DPs but only for the sound of it. For tuning, a good chip on 35is already delivers an upgrade of +60hp to 400hp.

dr_mikee · 04-04-2013, 02:32 PM

Does anyone know how much of an installation process this is? Is there a lot of welding that needs to be done? Also if someone can throw a number that a normal place should charge me to get these installed would be cool...Thanks guys

shashi27 · 04-04-2013, 09:00 PM

Haven't had a chance to install mine yet but I don't think there is any welding involved. There is an install vid on YouTube for the down pipes on 3 series.

Yeggman · 04-17-2013, 04:40 AM

Quote:

Originally Posted by Toink

A For tuning, a good chip on 35is already delivers an upgrade of +60hp to 400hp.

You've had a dyno that shows 400hp?

The_Hulk · 04-17-2013, 05:46 AM

My Z has just over 400hp

http://e89.zpost.com/forums/showthre...1#post12856917

VailM3 · 04-17-2013, 06:43 AM

wish was legal in Switzerland.....

Toink · 04-17-2013, 09:34 AM

Quote:

Originally Posted by Yeggman

You've had a dyno that shows 400hp?

I can give you some links on the German Z4 forum. Schmickler custom tunes cars (so with multiple dynoruns to optimize results). 400hp is not rare for 35is models which have no other adjustments from stock. Schmickler does fit additional cooling by the way.

For me I hope they squeeze out just a bit more. I have Milltek straight pipes instead of the secondary cats.

06-09-2012, 06:08 AM	#1
The_Hulk Private Drives: Alpine White 35i Join Date: Sep 2011 Location: Leeds, United Kingdom Posts: 78 iTrader: (0) Garage List BMW Z4 35i [0.00]	Catless downpipes I need help again from the more knowledgeable members. I'm wanting to buy some AR design downpipes but am worried that the catless option will have high emissions. The car must pass UK emissions test (MOT) when it's due and I'm not sure if this is possible with catless DP's. Does anybody know if it will fail the MOT with the second cats in place? or if there will be a big diffrence in emissions? Please help! Last edited by The_Hulk; 06-09-2012 at 10:07 AM.
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07-18-2012, 11:29 AM	#6
///MIKE Private First Class Drives: E89 35iS Join Date: Sep 2010 Location: Hong Kong Posts: 198 iTrader: (0)	What sort of gains are we looking at here? __________________ 2012 E89 35iS

07-19-2012, 10:08 AM	#7
Vintage Colonel Drives: 2010 Z4 35i and 2010 X5 35d Join Date: Aug 2009 Location: Austin, Texas Posts: 2,049 iTrader: (0)	they look great Attached Images

07-20-2012, 06:07 PM	#8
z4z4z4 First Lieutenant Drives: 2002 M3, 2011 Z4, & her 740Li Join Date: Mar 2010 Location: mild mediterranean breezes Posts: 388 iTrader: (1)	:bow : Racecats for e89....soOOOooo cool Vintage! __________________

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06-10-2012, 02:21 PM	#2
Vintage Colonel Drives: 2010 Z4 35i and 2010 X5 35d Join Date: Aug 2009 Location: Austin, Texas Posts: 2,049 iTrader: (0)	You can order them with Race Cats from AR, that is what I am doing just to make sure the car does not trip any codes.

07-16-2012, 03:15 AM	#4
Swallowbarn Registered Drives: Z4 35i DSG Join Date: Apr 2011 Location: Ross-on-Wye UK Posts: 3 iTrader: (0)	Any updates?

07-18-2012, 04:46 AM	#5
fre2bpowerless Private Drives: Yes. :D Join Date: Dec 2011 Location: MH, India Posts: 81 iTrader: (0)	I ordered the catless but then switched to race cats for the same reason - pass emissions, avoid smell, not trip codes.

10-19-2012, 02:53 PM	#11
theART Private Drives: Varies with season. Join Date: Feb 2010 Location: Vancouver, BC Posts: 92 iTrader: (1)	Do these trip engine code often on Z4? Also any one has dyno A/F readout to see if they pull fuel way back on stock ECU?

10-20-2012, 10:44 AM	#12
The_Hulk Private Drives: Alpine White 35i Join Date: Sep 2011 Location: Leeds, United Kingdom Posts: 78 iTrader: (0) Garage List BMW Z4 35i [0.00]	Catted DP's won't trip any codes, the DP's work better with a tune or i wouldn't bother.

01-08-2013, 01:53 AM	#13
Toink New Member Drives: E89 Z4 sDrive35is Join Date: Jan 2013 Location: Netherlands Posts: 27 iTrader: (0)	Any live material available on a regular 35is, 35is catless DP and 35is dp with racecats? I'm making up my mind on DPs but only for the sound of it. For tuning, a good chip on 35is already delivers an upgrade of +60hp to 400hp.

04-04-2013, 02:32 PM	#14
dr_mikee New Member Drives: e89 Z4 35is Join Date: Mar 2013 Location: NYC Posts: 25 iTrader: (0)	Does anyone know how much of an installation process this is? Is there a lot of welding that needs to be done? Also if someone can throw a number that a normal place should charge me to get these installed would be cool...Thanks guys

04-04-2013, 09:00 PM	#15
shashi27 Private Drives: 11 Z4 35is Join Date: Jan 2011 Location: NJ, USA Posts: 79 iTrader: (0)	Haven't had a chance to install mine yet but I don't think there is any welding involved. There is an install vid on YouTube for the down pipes on 3 series.

04-17-2013, 05:46 AM	#17
The_Hulk Private Drives: Alpine White 35i Join Date: Sep 2011 Location: Leeds, United Kingdom Posts: 78 iTrader: (0) Garage List BMW Z4 35i [0.00]	My Z has just over 400hp http://e89.zpost.com/forums/showthre...1#post12856917

04-17-2013, 06:43 AM	#18
VailM3 Second Lieutenant Drives: 2011 Z4 35is Join Date: Jan 2013 Location: Geneva Switzerland Posts: 252 iTrader: (0)	wish was legal in Switzerland.....