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      06-09-2012, 06:08 AM   #1
The_Hulk
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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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      06-10-2012, 02:21 PM   #2
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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.
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      06-11-2012, 05:00 AM   #3
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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.
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      07-16-2012, 03:15 AM   #4
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Any updates?
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      07-18-2012, 04:46 AM   #5
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I ordered the catless but then switched to race cats for the same reason - pass emissions, avoid smell, not trip codes.
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      07-18-2012, 11:29 AM   #6
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What sort of gains are we looking at here?
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      07-19-2012, 10:08 AM   #7
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they look great
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      07-20-2012, 06:07 PM   #8
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:bow :
Racecats for e89....soOOOooo cool Vintage!
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      07-22-2012, 08:47 AM   #9
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: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
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      07-23-2012, 02:58 PM   #10
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Quote:
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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.
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      10-19-2012, 02:53 PM   #11
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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?
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      10-20-2012, 10:44 AM   #12
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Catted DP's won't trip any codes, the DP's work better with a tune or i wouldn't bother.
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      01-08-2013, 01:53 AM   #13
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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.
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      04-04-2013, 02:32 PM   #14
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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
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      04-04-2013, 09:00 PM   #15
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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.
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      04-17-2013, 04:40 AM   #16
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Quote:
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A For tuning, a good chip on 35is already delivers an upgrade of +60hp to 400hp.
You've had a dyno that shows 400hp?
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      04-17-2013, 05:46 AM   #17
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My Z has just over 400hp

http://e89.zpost.com/forums/showthre...1#post12856917
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      04-17-2013, 06:43 AM   #18
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wish was legal in Switzerland.....
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      04-17-2013, 09:34 AM   #19
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Quote:
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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.
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      06-28-2013, 09:35 PM   #20
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Quote:
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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.
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      07-02-2013, 11:29 AM   #21
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no - the Eisenmann was installed a couple of years ago; if I had to do it all over again, I would save the exhaust $$$$ and just order the AR catless, ceramic coated DPs. you see, I had to order the more expensive catted DPs because the Eisenmann eliminates the secondary cats and I did not want to run without any cats at all
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      07-02-2013, 09:38 PM   #22
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Quote:
Originally Posted by Vintage View Post
no - the Eisenmann was installed a couple of years ago; if I had to do it all over again, I would save the exhaust $$$$ 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.)
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