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  1. #1
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    Exhaust or intake mods to the 335d

    I don't know about all of you, but my 335d might be a little too quiet. You can barely hear the whistle of the turbo and the exhaust is quite tame.

    Has anyone heard a 335d with either intake or exhaust changes?

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    I haven't seen many intake or exhaust options for the 335d.

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    Closest thing to an intake mod I've seen, I have:

    A K&N Filter. Click here to enlarge

    I would argue that under WOT, the audio is far from tame, however.
    Click here to enlarge

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    probably going to need to do some custom work, intake side, not much to do beside air filter i would think, and then exhaust, any muffler place can do acat back for you. post some pics of under the hood and lets see what we are working with Click here to enlarge

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    Click here to enlarge Originally Posted by Ronin Click here to enlarge
    Closest thing to an intake mod I've seen, I have:

    A K&N Filter. Click here to enlarge

    I would argue that under WOT, the audio is far from tame, however.
    You are right. If I am honest, it is probably in intake that I would like more noise from. I would like to hear those turbo's spooling up!

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    probably going to need to do some custom work, intake side, not much to do beside air filter i would think, and then exhaust, any muffler place can do acat back for you. post some pics of under the hood and lets see what we are working with Click here to enlarge
    It's not that simple with the exhaust. You're forgetting about the urea system back there, and how that complicates things dramatically.

    Under the hood coming tomorrow, when I actually have my DSLR on me. Click here to enlarge
    Click here to enlarge

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    not familiar at all with a urea system, got pics of that as well Click here to enlarge

    nobody said it would be cheap Click here to enlarge

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    not familiar at all with a urea system, got pics of that as well Click here to enlarge

    nobody said it would be cheap Click here to enlarge
    Urea system isn't easy to photograph. It's pretty much encompassed by body panels.

    This is the jist of what's going on there, though.

    Click here to enlarge
    Click here to enlarge

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    Awesome work- first photo I have seen of the urea system

    It looks like the rear muffler could be replaced without impacting the setup.

    You tube has some good exhaust clips of modded 330d's and they sound great with a high flow setup

    Does anyone know if the 335d has the setup that opens a valve under full throttle like 335i

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    Awesome work- first photo I have seen of the urea system

    It looks like the rear muffler could be replaced without impacting the setup.

    You tube has some good exhaust clips of modded 330d's and they sound great with a high flow setup

    Does anyone know if the 335d has the setup that opens a valve under full throttle like 335i

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    wow, much more intense than i imagined.. good luck on that one Click here to enlarge

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    Click here to enlarge Originally Posted by dwink Click here to enlarge
    Awesome work- first photo I have seen of the urea system

    It looks like the rear muffler could be replaced without impacting the setup.

    You tube has some good exhaust clips of modded 330d's and they sound great with a high flow setup

    Does anyone know if the 335d has the setup that opens a valve under full throttle like 335i
    With the 335d, both pipes are open full time, but it doesn't really matter, since there's really no exhaust sounds coming out of the ass end. It's all engine.

    Regarding the tips, I just painted mine, instead of replacing them. I think they look pretty good. (clip of exhaust sound and tips coming shortly).

    Click here to enlarge
    Click here to enlarge

    Last edited by Ronin; 08-10-2010 at 05:17 PM.
    Click here to enlarge

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    In europe these engines can go up to 350-380hp. It depends how much you want to push to its limit. The first issue will be the gearbox to handle the increased torque. Then, besides the increased heat from raising the boost, the turbos will facing a extra heat due to the DPF blocking and increased exhaust flow. this will lead to exhaust headers and turbos quickly wear. But with the stock longer gears, and now the 3rd gen having 7th gears, you don't need much effort from the engine to hit fast prohibited speeds.

    As for the sound, my car has straight pipes from DPF to back. No muffler at all. It still is quieter and just increased a bit the exhaust tone with a small whistle sound.

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    Just find the first cat and chop off everything from in front of it. Click here to enlarge

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    do you have to refill the tank with DEF?
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    Click here to enlarge

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    do you have to refill the tank with DEF?
    Yes. The DEF has its own tank - actually 2 tanks, one supplies the DPF actively, the second tank is passive "supply".

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    Click here to enlarge Originally Posted by Tiago Click here to enlarge
    I've heard modified exhausts on the d...just nothing in the states. I really, really, REALLY want someone to take my car and make something happen. I love the sound the engine makes, but to hear something coming out of the back end of the car would be MUSIC to my ears.

    The other point of note is that BMW spent a very long time working on the acoustics of the engine to make it sound the way it does, so the exhaust note needs to compliment the engine note, else it will be a disharmonious mix, and a waste of time. I won't have my exhaust being all tinny and high with the deep throated baritone coming out of my engine bay when I'm WOT.
    Click here to enlarge

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    What about chip tunning? How much additional HP could be achieved from such engine http://www.dsautomobiles.com/sport-c...0touring/10/67 ?

  20. #20
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    Click here to enlarge Originally Posted by Model Click here to enlarge
    What about chip tunning? How much additional HP could be achieved from such engine http://www.dsautomobiles.com/sport-c...0touring/10/67 ?
    Not familiar with that tuner but yes, greatest gains come from chip tuning as seen here: http://www.bimmerboost.com/showthrea...d-X5-35D-tunes

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    The biggest gain you will get would be from removing the DPF (besides a tune, of course) . Your mileage and power will both increase with this. But, you're driving a BMW, not a VW so I think it would be hard to pull these things without thinking about the resale.
    Last edited by Ryan Mills; 02-13-2011 at 09:50 PM.

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    I've been following a development of a E90 330d and without the DPF the car lose about 30-40hp. With DPF and tune it makes 300hp. This shows that these cars is so well developed to work with DPF that to take advantage with the removing you also need to upgrade other parts like turbo and who knows what else.

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    One of the more prominent flash tuners over here makes this flash for a 335d


    before after difference
    Power 210 kw 247 kw 37 kw
    HP 286 hp 336 hp 50 pk
    Torque 580 nm 710 nm 130 nm
    at rpm 1750 tpm 1750 tpm 0 tpm
    Topspeed 250 km/h 300 km/h 50 km/h


    Edit: tables do not work here...

    Click here to enlarge
    Last edited by DavidV; 02-14-2011 at 08:27 AM. Reason: added dyno chart
    There are two theories to arguing with women. Neither one works

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    1 out of 1 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by Ryan Mills Click here to enlarge
    The biggest gain you will get would be from removing the DPF (besides a tune, of course) . Your mileage and power will both increase with this. But, you're driving a BMW, not a VW so I think it would be hard to pull these things without thinking about the resale.
    The DPF is thoroughly integrated with the CPU, so anyone taking off the DPF would need someone well versed in BMW computer code. I don't think it would be worth the cost or effort to do this.

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    ^ I agree. It's a shame that this is the case though. If there was a way to start from scratch and remove all of the restrictions in the exhaust, the engine would be even more efficient and powerful. The duramax and the Volkswagen guys make a substantial increase in power and economy when removing the DPF. Oh well. If someone wants more power than a tune can provide, there is always propane Click here to enlarge

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