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  1. #1
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    iCarbon Catted and Non Downpipes

    I just came across this and it looks like there is an alternative to AR for the N55 guys and yet another option for us N54 people. A great write up by HP Autowerks here.

    Click here to enlarge Originally Posted by HP Autowerks
    Click here to enlarge

    This mod is definitely noticeable by the seat of the pants. After we installed the pipe we drove to the dyno and the whole way there car just felt way better. It was hard to believe that the downpipe alone was responsible for the significant increase in power plus it added a nice growl to the exhaust note. Nothing outrageous or look at me loud, just that nice sporty exhaust note that all BMWs should come with and it sounded even better with the quick shifting DCT.

    Keep in mind that we completely reverted our car back to stock. We gained at least 17 hp and 16 ft/lb at the largest separation of the graph.
    ....
    *** This DP Fits both 135 and 335i with the N55 egine

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    Here is the result when Berk Technology exhaust(with rear muffler) is added.

    Green - Stock
    Red - iCarbon Performance catless DP
    Blue - The above with Berk Technology Exhaust added

    Again, we picked up power everywhere. Max tq is 273.5 and hp is 269.7. In comparison without the Berk exhaust, max tq was 267.8 and hp is 260.7

    In stock trim the 135i N55 made 254 tq and 251 hp

    Remember this is on a SuperFlow dyno. Dynojet numbers will be higher.

    Click here to enlarge
    Also a photoshoot by vendor DTMrack.com posted here.

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    Apparently they coat them with something to make them 'titanium edition'. Here are the N54 pipes pre-coating

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  2. #2
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    I found the group buy by HP Autowerks for the non-titanium edition, catless downpipes.

    Click here to enlarge Originally Posted by HP Autowerks
    Retail Price: $679 + shipping

    Intro price for the first 50 units: $525 w/ FREE Fedex GROUND SHIPPING within continent USA(exclude Alaska, Hawaii, U.S. Virgin Islands). International orders please inquire on shipping costs.

    Optional Black Ceremic Coating: $95
    original thread here
    Click here to enlarge

  3. #3
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    Great to see N55 options. Hoping modding of this motor really gets going in 2011.

  4. #4
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    Only problem is that cat is TINY
    Click here to enlarge
    sales@ardesign.info | tel. 303.351.3515| www.ardesign.info
    Powering some of the world's fastest BMWs

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    Click here to enlarge Originally Posted by ar design Click here to enlarge
    Only problem is that cat is TINY
    Why is that bad?

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    Restricts flow.

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    Click here to enlarge Originally Posted by Jimefam Click here to enlarge
    Restricts flow.
    Isn't it more about the cell count than size?

  8. #8
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Isn't it more about the cell count than size?
    Both are critical.
    Click here to enlarge
    sales@ardesign.info | tel. 303.351.3515| www.ardesign.info
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    Damn you are quite the early riser. Saw pics of the manifold btw, gotta save up to get you to make me a custom N63 twin scroll!

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Isn't it more about the cell count than size?
    Regardless what they tell you size matters.

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    Click here to enlarge Originally Posted by Jimefam Click here to enlarge
    Regardless what they tell you size matters.
    So you want a bigger cat ideally? Why?

    Wouldn't a smaller one heat faster?

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    Lol it was a play on words but yes I would want the larger cat. Although the smaller one would heat up quicker I'd prefer the maximum flow of the larger cat. I'm sure the pro's will enlighten us when he has the time.

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    Click here to enlarge Originally Posted by Jimefam Click here to enlarge
    Lol it was a play on words but yes I would want the larger cat. Although the smaller one would heat up quicker I'd prefer the maximum flow of the larger cat. I'm sure the pro's will enlighten us when he has the time.

    This. Why do you think the stock cat is so HUGE, if it could do the same job as this one bmw would have made it..usually with cats you want to increase size to keep flow up...

  14. #14
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    Ok, I see, so proper balance of size and cell count ftw.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Ok, I see, so proper balance of size and cell count ftw.
    Correct. Replacing the massive OEM cat with a tiny high flow one isnt going to do much.....

    But replacing it with a 5" body high flow cat.... Click here to enlarge
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    sales@ardesign.info | tel. 303.351.3515| www.ardesign.info
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