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  1. #1
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    Lightbulb cp-e N55 Downpipe preview

    A N55 355i Owner was kind enough to stop by last week for some testing of a prototype unit of the cp-e N55 downpipe.

    The day went perfectly for such testing. The part was designed and built completely from computer data, without any fabrication on the car. The part was already ready without being in any vehicle prior. This was a true testament to doing CAD development in the most effecient way possible.

    Fitment was dead on, lining up with brackets, flanges and sensors flawlessly. Performance was to our satisfaction as well. Dyno charts below.

    Some basic overviews:

    - Full 304 Stainless construction
    - CAM/CAD designed
    - ONLY 3 WELDS - great durability and precision of the part (precision=OEM like fitment)
    - CNC machined v-band flange and surfaces
    - Casting allows for smooth flow and transitions
    - 5" Diameter - great flow and allows for a large catalyst
    - 5" catalyst will provide high flow and effectiveness for those who seek compliance
    - Included additional O2 bung for Wideband and a bung for an EGT probe - cast in and tapped.

    All our parts, including this one when it comes out, carry a lifetime warranty.

    Enough talk!


    Click here to enlarge



    Dyno testing showed impressive gains at various sections of the power curve - the car felt a lot stronger through the RPMs. The graphs speak for themselves. As everyone knows - look beyond just the peak numbers.

    Stock baseline vs cp-e DP
    +17whp +21wtq - Great gains for just bolting on a part
    Click here to enlarge



    JB 4 Stage 2 Map 1 Baseline vs same tune with DP
    +10whp. The flow capability of the DP really shows with a bump of 25wtq in the mid range
    This is gains ON TOP of what are already gains over Stock - we are optimizing the performance of a bump in boost and a tune that the JB4 packs in.

    Click here to enlarge



    JB4 Stage 2 Map 2 vs Stock tune Baseline
    Massive gains over stock with a DP and tune. ~35whp ~50wtq in the mid range.

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge



    And a clip




    Please feel free to ask questions - Ill try my best to tend to the thread!

    Thank you all!
    Last edited by www.cp-e.com; 10-10-2011 at 03:58 PM.
    Custom Performance Engineering
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    Supporting BMW 1M | 135i | 335i | 535i and more

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  2. #2
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    wow very nice piece
    JB4LIFE

  3. #3
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    Really well done thread, good stuff CP-E. Promoting to front page.

  4. #4
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    Looks like another great downpipe in the N55 market. 5" Click here to enlarge

  5. #5
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    Click here to enlarge Originally Posted by leo985i Click here to enlarge
    Looks like another great downpipe in the N55 market. 5" Click here to enlarge
    It's beautiful.

  6. #6
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    downpipe aside, man the n55 guys really need a real turbo.

  7. #7
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    They sure do. That thing makes so much less power than an N54 with the current setups.

  8. #8
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    Click here to enlarge Originally Posted by leo985i Click here to enlarge
    They sure do. That thing makes so much less power than an N54 with the current setups.
    Should be simpler to get a big single on there though.

  9. #9
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    A lot simpler for sure, dunno why people haven't tacked this $#@! yet. I guess not even interest yet.......

  10. #10
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    Click here to enlarge Originally Posted by leo985i Click here to enlarge
    A lot simpler for sure, dunno why people haven't tacked this $#@! yet. I guess not even interest yet.......
    Just too early and too few.

  11. #11
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    The stock tune looks sloppy, the tuned run is just as bad. I simply don't under what BMW did with this engine. For reference I dynoed 242 bone stock on this very same dyno and ht 350 with a dci/meth and no other mods. For this engine to barely crack 270, that is just disappointing. Hopefully a better tune will smooth things out and try to squeeze out some more power.

  12. #12
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    That sounds amazing. 5" woah nelly. I think I'm in love....

  13. #13
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    Yeah it will take some time to really figure out how to tweak this engine some..not to mention most of the people who own a N55 are all leases these days, and those who finance are barely affording one.

    The people with the big money seem to have these just as daily drivers..no one is willing to drop the money for R&D..

  14. #14
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    Click here to enlarge Originally Posted by Matt@Camber-Toe Click here to enlarge
    Yeah it will take some time to really figure out how to tweak this engine some..not to mention most of the people who own a N55 are all leases these days, and those who finance are barely affording one.
    It's bad, the VAST majority are leases. We won't see this picking up steam until people buy them second hand and want to mod. Kind of a shame what is happening to the BMW tuning industry with people just renting the brand name instead of actually having a car.

  15. #15
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    ... BMW tuning industry with people just renting the brand name instead of actually having a car.
    I take offense to that statement... Click here to enlarge I'm actually financing mine, and still managing to do some Mods... Matt can attest to that... Although most of my mods are 'One Off' projects, that will probably never pick up steam
    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    until people buy them second hand and want to mod
    And once I own the car outright, I will go full steam on some of the more, radical mods, like hopefully a turbo upgrade... But that's a couple years off (2013)

    CP-E great news for the 335 owners... Now get cracking on a pipe for the X5... Click here to enlarge But make it a hi-flo catted variety...
    2013 Dodge Challenger R/T: CAI, Catch Can, Shorty Headers, Custom Exhuast, M.M. 87mm Throttle Body, DiabloToona Custom 93 Oct Tune, 190* Thermostat, Seibon CF Grille, 6.4 CAM, Inertia M.S Ported Cylinder Heads
    Pending Mods: T/A Hood, S/C

    2011 X5 35i Premium: Black Grille, Boopie Custom 3" Dual Exhaust & Custom N55 FMIC, JB3 (+3psi)

  16. #16
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    Click here to enlarge Originally Posted by leo985i Click here to enlarge
    They sure do. That thing makes so much less power than an N54 with the current setups.
    that dyno is a heartbreaker.

  17. #17
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    Catted version for those of us who must comply?

  18. #18
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    There will be a catted version.

    The 5" diameter allows us to put in a large catalyst that will be very effective and CEL free.
    Custom Performance Engineering
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    Supporting BMW 1M | 135i | 335i | 535i and more

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  19. #19
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    1 out of 1 members liked this post. Reputation: Yes | No
    Good news and eagerly awaited.

  20. #20
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    Click here to enlarge Originally Posted by FLYING X5 Click here to enlarge
    I take offense to that statement... I'm actually financing mine, and still managing to do some Mods... Matt can attest to that... Although most of my mods are 'One Off' projects, that will probably never pick up steam
    Absolutely, I understand why you would take offense. I am speaking generally which is accurate, obviously the crowd here is the exception.

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    2 out of 2 members liked this post. Reputation: Yes | No
    What fuel was used with these tests?

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    Hey I also own my 335d and paying for it. NO!! Im not rich or wealthy I just invested my inheritance correctly in housing and getting dividends, a question for you guys is there going to be any other MODS for the DIESEl besides JB piggyback, I am a willing GUINEA PIG in Puerto Rico willing to participate!!Click here to enlarge

  23. #23
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    I too am an outright owner. However, warranty retention is still an issue with the car so young. Hence, I am concentrating on "passive" modifications that help the car runn cooler and breathe better. Ultimately, I am thinking a larger turbo will be what is required for serious gains. However, I want to retain street manners, so not going to jump off the edge.

  24. #24
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    Click here to enlarge Originally Posted by Puerto Rican 335d Click here to enlarge
    Hey I also own my 335d and paying for it. NO!! Im not rich or wealthy I just invested my inheritance correctly in housing and getting dividends, a question for you guys is there going to be any other MODS for the DIESEl besides JB piggyback, I am a willing GUINEA PIG in Puerto Rico willing to participate!!Click here to enlarge
    As I had stated, most are barely doing it...you however are among the few doing it the right way. Most of my customers who finance seem to want to pay nothing for an install or always try to talk a price down because 'I just had my car payment and insurance last week, can you cut me a deal' type stuff. Gets old after a while.

  25. #25
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    Surely, one has to pay to play. Every goober out there is looking for a "sponsor."

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