• cp-e N55 Downpipe preview with pictures, dyno graphs, and video

      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!






      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




      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.





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













      And a clip





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

      Thank you all!
      This article was originally published in forum thread: cp-e N55 Downpipe preview started by www.cp-e.com View original post
      Comments 45 Comments
      1. Itsbrokeagain's Avatar
        Itsbrokeagain -
        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.
      1. maxnix's Avatar
        maxnix -
        Surely, one has to pay to play. Every goober out there is looking for a "sponsor."
      1. xerox445's Avatar
        xerox445 -
        Is there anything that could be welded into that 5 inch diamiter pipe that could potentially reduce turbulance or increase velocity on a non-catted model? It seems to me that a huge chamber like that your going to loose some exhaust energy and scavenging, or is the massive lack of backpressure enough to show great gains like this?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by xerox445 Click here to enlarge
        Is there anything that could be welded into that 5 inch diamiter pipe that could potentially reduce turbulance or increase velocity on a non-catted model? It seems to me that a huge chamber like that your going to loose some exhaust energy and scavenging, or is the massive lack of backpressure enough to show great gains like this?
        You want the reduction in backpressure.
      1. turugara's Avatar
        turugara -
        Click here to enlarge Originally Posted by Melinko Click here to enlarge
        What fuel was used with these tests?
        93 Octane Sunoco. This is great to see this make front page! Should be interesting to see what other's can make of these DP's with FBO + Meth and eventually bigger turbos. Next time I go down to CP-E, hopefully I can run a few more dynos to see if a new FMIC made any difference to smooth out the torque.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by turugara Click here to enlarge
        93 Octane Sunoco. This is great to see this make front page! Should be interesting to see what other's can make of these DP's with FBO + Meth and eventually bigger turbos. Next time I go down to CP-E, hopefully I can run a few more dynos to see if a new FMIC made any difference to smooth out the torque.
        This is your car?
      1. Puerto Rican 335d's Avatar
        Puerto Rican 335d -
        @maxnix , that being said. if you a car of this magnitude this not a "RICE BURNER" and parts are expensive as well as labor therefore if you want play you have to PAY!!!.
      1. turugara's Avatar
        turugara -
        Yeah that's my car.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by turugara Click here to enlarge
        Yeah that's my car.
        Nice ride.
      1. turugara's Avatar
        turugara -
        Thanks. Can't wait to see what's next with CP-E.
      1. maxnix's Avatar
        maxnix -
        Click here to enlarge Originally Posted by turugara Click here to enlarge
        Thanks. Can't wait to see what's next with CP-E.
        How about their charge pipe?
      1. turugara's Avatar
        turugara -
        Click here to enlarge Originally Posted by maxnix Click here to enlarge
        How about their charge pipe?
        Idk much about their charge pipe. I've seen pics of it online. I think it's rebranded as BMS?
      1. turugara's Avatar
        turugara -
        CP-E didn't post a pic of my car so I thought I would. Click here to enlarge


        Attachment 12360
      1. maxnix's Avatar
        maxnix -
        Click here to enlarge Originally Posted by turugara Click here to enlarge
        Idk much about their charge pipe. I've seen pics of it online. I think it's rebranded as BMS?
        Yes it is, and avaiable in Black with a bung for a good price.
      1. maxnix's Avatar
        maxnix -
        OK, did Santa bring a DP with catalyst?
      1. turugara's Avatar
        turugara -
        Update. Final version installed! Full install set and more videos coming

        Full set of Photos: https://www.facebook.com/media/set/?...9050604&type=3

        Attachment 13499
        Attachment 13500
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by turugara Click here to enlarge
        Update. Final version installed! Full install set and more videos coming

        Full set of Photos: https://www.facebook.com/media/set/?...9050604&type=3

        Attachment 13499
        Attachment 13500
        http://www.youtube.com/watch?feature...&v=f8PpS0DNVWw
        Very nicely done.
      1. maxnix's Avatar
        maxnix -
        So excuse my density, but is this catless or catted? Seems quiet for a catless, which is not a bad thing.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by maxnix Click here to enlarge
        So excuse my density, but is this catless or catted? Seems quiet for a catless, which is not a bad thing.
        I believe there are options for both.
      1. turugara's Avatar
        turugara -
        Catless. The quietness is because of the exhaust, not the downpipe. If you mate this with the HPF exhaust you will hear it many bridges away.