Downpipe for 1M???

[M3Power79]

Originally Posted by HP Autowerks

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

[Aqua]

Originally Posted by 1'M Blue

Installed the AR Catted DP's ... no check engine lights.

Will the CEL appear when you run the car hard?

[HP Autowerks]

Originally Posted by Aqua

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.

[1'M Blue]

Originally Posted by M3Power79

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.

[1'M Blue]

Originally Posted by Aqua

Will the CEL appear when you run the car hard?

I dont suppose it will show given you run it hard or normal..

[saurabh_turingMS]

Evolve automotive have a stage 3 tune for the 1M, which includes DP made by Supersprint and an EvolveR tune - no CEL issues.

[HP Autowerks]

Originally Posted by sverma

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.

[skycat]

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.

[Zuzu]

Originally Posted by HP Autowerks

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.

[MDORPHN]

Originally Posted by Zuzu

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

[Zuzu]

Originally Posted by MDORPHN

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..

[Tuned1M]

^ Yeah. I'd love to see the internals of both and compare.

[HP Autowerks]

Originally Posted by MDORPHN

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.

[NjSant]

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.

[m3dragon]

Originally Posted by ///Mcrazy

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.

[HP Autowerks]

Originally Posted by ///Mcrazy

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.