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Thread: BB downpipes

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    BB downpipes

    Does anyone have these 3" BB DP's and how do they compare to the AR DP's? They look real nice and are alot cheaper than the AR DP's.

    http://www.bbfabrication.info/

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    I had a few customers try them and they didn't fit. I wouldn't take the chance. Grab AR or if you want to safe a few dollars on quality DP we also carry the CPE 3".

    http://www.burgertuning.com/BMW_exhaust.html

    If you really want to save money and don't care about quality those $200 eBay downpipes fit and are serviceable.

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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    I had a few customers try them and they didn't fit. I wouldn't take the chance. Grab AR or if you want to safe a few dollars on quality DP we also carry the CPE 3".

    http://www.burgertuning.com/BMW_exhaust.html

    If you really want to save money and don't care about quality those $200 eBay downpipes fit and are serviceable.
    What do you mean by serviceable?

    I'm going for something that sounds nice and has mainly a 3" pipe not just a little section then tapers to a 2.5" right away.

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    They all taper to 2.25" for the factory catback pretty quick. The worlds faster N54 (133mph) was running 2.5" Ultimate Racing downpipes FWIW so not sure any of it matters much anyway. As long as they are catless.

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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    They all taper to 2.25" for the factory catback pretty quick. The worlds faster N54 (133mph) was running 2.5" Ultimate Racing downpipes FWIW so not sure any of it matters much anyway. As long as they are catless.
    I c. I don't get whats the use of having the 3" part going further back then?

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    Click here to enlarge Originally Posted by justohigh Click here to enlarge
    I c. I don't get whats the use of having the 3" part going further back then?
    Saying they are 3 inch sounds cool Click here to enlarge

    Go with CP-E, you will be happy.
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    Click here to enlarge Originally Posted by justohigh Click here to enlarge
    I c. I don't get whats the use of having the 3" part going further back then?
    Exhaust gas cools and condenses the further it gets down stream so in theory moving the chock point back is preferred. But in practice 10" doesn't seem to matter much. If all out performance is the goal it can't hurt to get the full 3". That's why we carry both. Click here to enlarge

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    Excuse me if this is a dumb question but is there a huge difference between high-flow cats and catless Dp's as far as performance goes?

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    Click here to enlarge Originally Posted by dOpEdUpM3 Click here to enlarge
    Excuse me if this is a dumb question but is there a huge difference between high-flow cats and catless Dp's as far as performance goes?
    The real question is, what do you consider huge? Assuming you are talking about the N54, what other mods and boost level will you being pushing?

    At 10psi I'm sure there will not be much difference between catless and catted, but start pushing 500whp of exhaust gas through those honeycombs at 17-20psi with meth and nitrous and the difference will be more noticeable.

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    I am running a set of AR design catted DP's. I love 'em. The difference was immediate after installing them with faster turbo spool and a smoother ride. Going to be going the catless route soon since I will be building more of a track car set up. If your interested in these DP's send me a PM. (they are about 3 months old)
    Click here to enlarge
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    1 out of 1 members liked this post. Reputation: Yes | No
    I bought some B and B pipes to save some $ and get the quality of the AR design. I ended up returning them for fitment issues, and going for AR design pipes. I couldn't be happier!

    I understand that the CP-e is an excellent choice as well if you want to go catless on a budget.

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    Click here to enlarge Originally Posted by mobilefitt Click here to enlarge
    I bought some B and B pipes to save some $ and get the quality of the AR design. I ended up returning them for fitment issues, and going for AR design pipes. I couldn't be happier!

    I understand that the CP-e is an excellent choice as well if you want to go catless on a budget.
    Thanks for the feedback. I don't think I've seen any first hand accounts of fitment before
    Click here to enlarge

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    I installed a set for some one who had an AT 135... The o2 sensor hit the transmission webbing structure. I ended up taking them off and putting them on a 6mt 135... No problems.

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    I had a set from justin at BB. 3" with no 2.5" taper. Great pipes.

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    Click here to enlarge Originally Posted by klipseracer Click here to enlarge
    I had a set from justin at BB. 3" with no 2.5" taper. Great pipes.
    Seems most people are happy with them, nice choice.
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