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      06-21-2012, 02:37 PM   #23
M3Power79
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Quote:
Originally Posted by HP Autowerks View Post
We have installed catless AR 3" DP. At Stage 2 GIAC software flash, it is worth about 8-12 whp over OEM. Catted version will be a bit less. The OEM DP's are actually very efficient and aren't the same ones BMW installed on the 135i and 335i.
Thx, i'm considering downpipes to increase the sound but a bit extra power is always welcome
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      06-21-2012, 10:18 PM   #24
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Quote:
Originally Posted by 1'M Blue View Post
Installed the AR Catted DP's ... no check engine lights.
Will the CEL appear when you run the car hard?
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      06-21-2012, 10:22 PM   #25
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Quote:
Originally Posted by Aqua View Post
Will the CEL appear when you run the car hard?
With catless DP CEL is a given. In some very rare cases the CEL might not illuminate.
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      06-22-2012, 03:01 AM   #26
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Quote:
Originally Posted by M3Power79 View Post
and what are you're first impressions?
Soundwise?
Power?
Throttle respons?

Thx.
I have installed it along with a Akrapovic evolution system (with the wireless kit)... sounds superb with the valve open and very intense and addicting !!

but when the valve is closed its very smooth and close to stock.

It pulls very strong on mid range with good throttle response.
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      06-22-2012, 03:02 AM   #27
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Quote:
Originally Posted by Aqua View Post
Will the CEL appear when you run the car hard?
I dont suppose it will show given you run it hard or normal..
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      06-23-2012, 06:21 PM   #28
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Evolve

Evolve automotive have a stage 3 tune for the 1M, which includes DP made by Supersprint and an EvolveR tune - no CEL issues.
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      06-25-2012, 01:32 AM   #29
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Quote:
Originally Posted by sverma View Post
Evolve automotive have a stage 3 tune for the 1M, which includes DP made by Supersprint and an EvolveR tune - no CEL issues.
Of course, that line of coding has been turned off.
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      06-25-2012, 05:50 AM   #30
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1M dumps

I replaced a mid pipe last week on a IM so i did a comparison of dumps looking from the dump outlet as we have many stock cats in stock .
I could not see any difference, the cat component looks the same as a stock 135/335 cat, i reckon the extra power comes from a better tune i guess time will tell.
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      06-25-2012, 07:24 AM   #31
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Quote:
Originally Posted by HP Autowerks View Post
The OEM DP's are actually very efficient and aren't the same ones BMW installed on the 135i and 335i.
In which way.. Do we have any hard data to justify this claim.

Does the 1M have less restrictive high flow cats as OEM, as the actual 1M DP's are very similar to the 135i/335i.
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      06-25-2012, 08:26 AM   #32
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Quote:
Originally Posted by Zuzu View Post
In which way.. Do we have any hard data to justify this claim.

Does the 1M have less restrictive high flow cats as OEM, as the actual 1M DP's are very similar to the 135i/335i.
I believe that they have different part numbers.

Neil
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      06-25-2012, 08:29 AM   #33
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Quote:
Originally Posted by MDORPHN View Post
I believe that they have different part numbers.

Neil
Thanks Neil.... Yeh I have researched..

1M DP:
No. Description Supplement Qty From Up To Part Number Price Notes Photo
01 Rmfd primary catalytic converter ZYL. 1-3 1 18307980403
02 Rmfd primary catalytic converter ZYL. 4-6 1 18307980404


135i DP:
No. Description Supplement Qty From Up To Part Number Price Notes Photo
01 Rmfd primary catalytic converter ZYL. 1-3 1 18307553594
02 Rmfd primary catalytic converter ZYL. 4-6 1 18307553595


Just wanted to know, what was the actual difference in engineering..

Last edited by Zuzu; 06-25-2012 at 08:44 AM.
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      06-26-2012, 12:55 PM   #34
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^ Yeah. I'd love to see the internals of both and compare.
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      06-26-2012, 02:40 PM   #35
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Quote:
Originally Posted by MDORPHN View Post
I believe that they have different part numbers.

Neil
Yes, and the 1M DP's flows a lot more air than the typical N54 versions.
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      06-27-2012, 02:18 PM   #36
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Can anyone running catless DP's comment on the smell? I know the turbo motors run cleaner than NA but I just dont know if I'd be able to live with it.
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      06-27-2012, 02:35 PM   #37
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Quote:
Originally Posted by ///Mcrazy View Post
Can anyone running catless DP's comment on the smell? I know the turbo motors run cleaner than NA but I just dont know if I'd be able to live with it.
I have been told by several buddies with N54 motors that running no cats smells BAD especially in traffic. I was going to go with cat free DP but after talking to them I am leaving them and just doing post cat 1 section back.
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      06-27-2012, 02:55 PM   #38
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Quote:
Originally Posted by ///Mcrazy View Post
Can anyone running catless DP's comment on the smell? I know the turbo motors run cleaner than NA but I just dont know if I'd be able to live with it.
Although the direct injection engines run more efficiently you will still get the unburned hydro carbon smell, especially if you were just sitting in traffic. If you were to keep the oem mid pipes in place, the smell is cut down a bit.
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      05-03-2018, 12:29 PM   #39
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      05-10-2018, 09:47 PM   #40
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Quote:
Originally Posted by NjSant View Post
Can anyone running catless DP's comment on the smell? I know the turbo motors run cleaner than NA but I just dont know if I'd be able to live with it.
Well I don't sit in traffic much, but I still have a pretty good nose according to my friends that share wine with me and I have never smelled anything since putting in DP 4000 miles ago bearing in mind that still have the mid-pipe cat.
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      05-17-2018, 10:16 AM   #41
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I have the MadDad midpipe and OEM downpipes (among other things, see sig).

When I asked MHD whether I should run stage 1+ or stage 2+ OTS maps, they recommended stage 2 for the 1M. On stage 2+ maps, at WOT power deliver is smooth and logs look good but above about 5k RPMs actual load is slightly lower than load requested. Part throttle is perfect up to about 60% pedal input, but I have power surges if I ask for anything between about 60% to 80% pedal input. This occurs on 91, 93 or 95 octane maps (properly fueled). Just yesterday I decided to shell out another $49 for the Stage 1 pack, and flashed Stage 1+ 93 Octane. So far it seems the surging issue is solved.

My suspicion is that despite the 1M having better flowing downpipes/high flow cats compared to other N54 cars, they are not quite good enough for Stage 2+ power levels.
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      05-18-2018, 11:34 AM   #42
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Quote:
Originally Posted by Kiwi Peter View Post
I replaced a mid pipe last week on a IM so i did a comparison of dumps looking from the dump outlet as we have many stock cats in stock .
I could not see any difference, the cat component looks the same as a stock 135/335 cat, i reckon the extra power comes from a better tune i guess time will tell.
Iíve done the same and also have some cut out mid pipe cats here. The 1M and 135i cats in the DPís look identical to one another. They also look identical to the mid pipe cats Iíve got here. Iíd wager the different part numbers are perhaps different cone angles/dimensions for the front/rear of the cats or something minor like flange angle.

Iíve crudely measured the mid pipe cats with a small piece of cardboard with a ruler drawn on and got 440cpsi.


Quote:
Originally Posted by Zuzu View Post
In which way.. Do we have any hard data to justify this claim.

Does the 1M have less restrictive high flow cats as OEM, as the actual 1M DP's are very similar to the 135i/335i.
No hard data that Iíve seen. Mine are still visually the same as the mid pipe cats and still ceramic (Iíll measure them soon) but I estimate 440cpsi like the mid pipe cats. Something like a HJS Euro 4 is going to flow better for sure, and catless better again. Going fully catless on an N54 smells terrible though I would not recommend it.
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