New 2009 2010 BMW Z4 - ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   New 2009 2010 BMW Z4 - ZPOST > BMW Z4 Forum (E89) > Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications

Post Reply
 
Thread Tools Search this Thread
      06-09-2012, 06:08 AM   #1
The_Hulk
Private
14
Rep
77
Posts

Drives: Alpine White 35i
Join Date: Sep 2011
Location: Leeds, United Kingdom

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..
Appreciate 0
      06-10-2012, 02:21 PM   #2
Vintage
Colonel
Vintage's Avatar
United_States
378
Rep
2,588
Posts

Drives: BMW G80 (MT), 718 Spyder
Join Date: Aug 2009
Location: Austin, Texas

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.
Appreciate 0
      06-11-2012, 05:00 AM   #3
The_Hulk
Private
14
Rep
77
Posts

Drives: Alpine White 35i
Join Date: Sep 2011
Location: Leeds, United Kingdom

iTrader: (0)

Garage List
BMW Z4 35i  [0.00]
Quote:
Originally Posted by VintageBMW View Post
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.

Last edited by The_Hulk; 06-11-2012 at 05:20 AM..
Appreciate 0
      07-16-2012, 03:15 AM   #4
Swallowbarn
New Member
0
Rep
5
Posts

Drives: Z4 35i DSG
Join Date: Apr 2011
Location: Ross-on-Wye UK

iTrader: (0)

Any updates?
Appreciate 0
      07-18-2012, 04:46 AM   #5
fre2bpowerless
Private First Class
India
5
Rep
129
Posts

Drives: Yes. :D
Join Date: Dec 2011
Location: India

iTrader: (0)

I ordered the catless but then switched to race cats for the same reason - pass emissions, avoid smell, not trip codes.
Appreciate 0
      07-18-2012, 11:29 AM   #6
///MIKE
Second Lieutenant
///MIKE's Avatar
11
Rep
202
Posts

Drives: E89 35iS
Join Date: Sep 2010
Location: Hong Kong

iTrader: (0)

What sort of gains are we looking at here?
__________________
2012 E89 35iS
Appreciate 0
      07-19-2012, 10:08 AM   #7
Vintage
Colonel
Vintage's Avatar
United_States
378
Rep
2,588
Posts

Drives: BMW G80 (MT), 718 Spyder
Join Date: Aug 2009
Location: Austin, Texas

iTrader: (0)

they look great
Attached Images
 
Appreciate 0
      07-20-2012, 06:07 PM   #8
z4z4z4
Lieutenant
z4z4z4's Avatar
United_States
45
Rep
548
Posts

Drives: 2002 M3
Join Date: Mar 2010
Location: mild mediterranean breezes

iTrader: (1)

:bow :
Racecats for e89....soOOOooo cool Vintage!
__________________
Sold 2011 Z4, kept 2002 M3
PM for various e89 parts 4sale.
Appreciate 0
      07-22-2012, 08:47 AM   #9
Vintage
Colonel
Vintage's Avatar
United_States
378
Rep
2,588
Posts

Drives: BMW G80 (MT), 718 Spyder
Join Date: Aug 2009
Location: Austin, Texas

iTrader: (0)

Quote:
Originally Posted by z4z4z4 View Post
: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
Appreciate 0
      07-23-2012, 02:58 PM   #10
z4z4z4
Lieutenant
z4z4z4's Avatar
United_States
45
Rep
548
Posts

Drives: 2002 M3
Join Date: Mar 2010
Location: mild mediterranean breezes

iTrader: (1)

Quote:
Originally Posted by ///MIKE View Post
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.
__________________
Sold 2011 Z4, kept 2002 M3
PM for various e89 parts 4sale.
Appreciate 0
      10-19-2012, 02:53 PM   #11
theART
Private First Class
6
Rep
110
Posts

Drives: Varies with season.
Join Date: Feb 2010
Location: Vancouver, BC

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?
Appreciate 0
      10-20-2012, 10:44 AM   #12
The_Hulk
Private
14
Rep
77
Posts

Drives: Alpine White 35i
Join Date: Sep 2011
Location: Leeds, United Kingdom

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.
Appreciate 0
      01-08-2013, 12:53 AM   #13
Toink
Enlisted Member
Toink's Avatar
7
Rep
33
Posts

Drives: E89 Z4 sDrive35is
Join Date: Jan 2013
Location: Netherlands

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.
Appreciate 0
      04-04-2013, 02:32 PM   #14
dr_mikee
New Member
2
Rep
26
Posts

Drives: e89 Z4 35is
Join Date: Mar 2013
Location: NYC

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
Appreciate 0
      04-04-2013, 09:00 PM   #15
shashi27
Private
7
Rep
84
Posts

Drives: 11 Z4 35is
Join Date: Jan 2011
Location: NJ, USA

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.
Appreciate 0
      04-17-2013, 04:40 AM   #16
Yeggman
Private First Class
5
Rep
108
Posts

Drives: 2009 Z4 s3.0i 6MT
Join Date: Sep 2012
Location: Florida

iTrader: (0)

Quote:
Originally Posted by Toink View Post
A For tuning, a good chip on 35is already delivers an upgrade of +60hp to 400hp.
You've had a dyno that shows 400hp?
Appreciate 0
      04-17-2013, 05:46 AM   #17
The_Hulk
Private
14
Rep
77
Posts

Drives: Alpine White 35i
Join Date: Sep 2011
Location: Leeds, United Kingdom

iTrader: (0)

Garage List
BMW Z4 35i  [0.00]
My Z has just over 400hp

http://e89.zpost.com/forums/showthre...1#post12856917
Appreciate 0
      04-17-2013, 06:43 AM   #18
VailM3
Captain
61
Rep
769
Posts

Drives: 2011 Z4 35is
Join Date: Jan 2013
Location: Geneva Switzerland

iTrader: (0)

wish was legal in Switzerland.....
Appreciate 0
      04-17-2013, 09:34 AM   #19
Toink
Enlisted Member
Toink's Avatar
7
Rep
33
Posts

Drives: E89 Z4 sDrive35is
Join Date: Jan 2013
Location: Netherlands

iTrader: (0)

Quote:
Originally Posted by Yeggman View Post
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.
Appreciate 0
      06-28-2013, 09:35 PM   #20
jparnes1
Colonel
jparnes1's Avatar
No_Country
241
Rep
2,389
Posts

Drives: 2016 340i, 2012 Z4 35i
Join Date: Jan 2010
Location: NY

iTrader: (1)

Quote:
Originally Posted by Vintage View Post
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.
Vintage, did you install your DP's before your exhaust? I'm wondering what your impression was with the AR DP's and stock exhaust.
__________________
2016 340i XDrive, EBII/black, 6 MT, M Sport, Track Handling, Cold Weather, Tech, Lighting, Driver Assistance Plus.

2012 Z4 35i, ED 2/24/2012, Melbourne Red Metallic, Black Leather, Carbon Trim, 6MT, M Sport, CW, PP, PS, NAV, CA.
Appreciate 0
      07-02-2013, 11:29 AM   #21
Vintage
Colonel
Vintage's Avatar
United_States
378
Rep
2,588
Posts

Drives: BMW G80 (MT), 718 Spyder
Join Date: Aug 2009
Location: Austin, Texas

iTrader: (0)

no - the Eisenmann was installed a couple of years ago; if I had to do it all over again, I would save the exhaust $$$$ and just order the AR catless, ceramic coated DPs. you see, I had to order the more expensive catted DPs because the Eisenmann eliminates the secondary cats and I did not want to run without any cats at all
Appreciate 0
      07-02-2013, 09:38 PM   #22
Hujan
Brigadier General
Hujan's Avatar
United_States
567
Rep
3,742
Posts

Drives: M3
Join Date: Apr 2013
Location: .

iTrader: (16)

Quote:
Originally Posted by Vintage View Post
no - the Eisenmann was installed a couple of years ago; if I had to do it all over again, I would save the exhaust $$$$ and just order the AR catless, ceramic coated DPs. you see, I had to order the more expensive catted DPs because the Eisenmann eliminates the secondary cats and I did not want to run without any cats at all
How do you find the noise levels/drone compared to the Eisenmann with the stock DPs?

I am toying with the idea of getting the AR designs catted DPs with a Milltek exhaust (which also removes the secondary cats and the resonators) but am concerned it would be too loud and raspy.

I am running the Akrapovic DP on my Mini (100 cpsi cat) with an exhaust that removes the secondary cat and it is a little too boomy and raspy for my taste. (And that's with a resonator.)
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 04:29 PM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST