1996 E36 328i headers (will they fit?) and de-cat? help?

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  1. 1996 E36 328i headers (will they fit?) and de-cat? help? 
    #1
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    hi

    jus wondered if any of you guys could advice on these headers...
    i have an RHD e36 328isc.. looking for a few low cost mods hoping to get a little more power, found a set of headers linked bellow... says for the 320I and 323I, will they fit on my 328? and will there be any gains?

    http://racebits.org/index.php?main_p...fb1e6dnsts42l7


    also theres a de-cat exhaust system... any idea on what gain there will be with this?

    http://racebits.org/index.php?main_p...fb1e6dnsts42l7



    any help would be much appreciated thanks.
     
     

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    Sorry to wander but 30bhp increase from a 328 de-cat? Is that true or are manufacturers really really milking it nowa-days?
     
     

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    mistreku (11-07-2010)

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    yea i wasnt thinking 30bhp gain to be true atall.... any idea of what gains cud be had from either headers or decat full system?
    and will them headers even fit a 328?
     
     

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    They'll fit all of the M50/M52 series of engines, 320/323/325 and 328.
    You could even fit them onto an M3 if the rest of the exhaust was converted back to non M spec.
    They won't give anywhere near the gains claimed, and infact it's highly unlikely they'll do anything as they look a bodge job in shiny metal compared to the M52 standard tubular manifold.

    An upgrade from the cast manifolds on an M50 (320/325) is to use the M52 tubular version, but a polished exterior, and no obvious planning won't be giving you anything more.



    That's what you call a good manifold, taken from the M3 3.2.
     
     

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    luke157 (07-07-2010)

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    soo them headers in the link i posted would be a waste of time on a 328is? there jus for looks? if soo il give them a miss,

    what do you think on the de-cat system also on link on my post above??

    or any advice how to get some gains from the 328?
     
     

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    The manifolds look like an exact copy of what you have already, just tarted up...
    The decat might work, although it looks like it'll be quite a noisy system.

    I have seen some stainless equal length manifolds to fit your engine, which are the stubby type for M50 and M52 (the M3 has the downpipe/cat join right down by a chassis brace bar, whilst the others have the join halfway down the side of the engine)
    They look like they have some planning gone into them, so if you see a cheap "spaghetti" manifold in stainless, you're more likely to get a power increase.

    If you can get one, you can fit a complete M3 exhaust as long as you get the manifolds too, you'll want the evo manifolds as they have the lambda holes in the manifold, but they'll be expensive too.

    The M50 intake manifold is a must, that'll net you more BHP than any other modification going, bar superchargers etc.

    For a dirt cheap decat, find someone with a busted/worn cat, cut the sides, and gut it, and get it welded back up again.
    You might even be able to sell on the cat internals for the platinum catalyst too.
     
     

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    http://www.alibaba.com/product-gs/28...r_for_BMW.html

    That's the "spaghetti" manifold i mentioned. Most of this stuff comes over on a slow boat from China, so don't fall into any company telling you how they specially designed it, especially those that sell loads of different types, and haven't realised that apart from lambda holes in the later manifolds, the fitment is exactly the same.
     
     

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    ok thanks, yea noisy system i dont mind... but if the de-cat part is the only bit that will give a gain rather then the rest of the system, il jus find a cheaper way of getting a decat, i guess?


    soo "spaghetti" manifold header would be the best option if i can get hold of one? much gain to be had with this?


    yes ive heard about the M50 intake manifold, only problem is loose torque with this mod dont you?
     
     

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    The will be a loss of torque due to the removal of a velocity effect of packing the air in.
    The narrow runners speed up the airflow and the momentum of the air pushes more into the cylinder, increasing the toque/power output.
    It's a common feature of engines these days to add intake manifolds designed that way as the majority of driving is down in the lower revs.
    The loss is small, and many people don't notice it, but it is far outweighed by the power increase about 4- 4.5k where previously the ram effect becomes in-efficient, and the intake holds back the engine.
    You could expect to gain 20-30bhp from the swap, which is huge value for money.

    I can't say how much the second manifold would gain, but by looking, at least someone has put a bit of thought into it. It might have no effect whatsoever, but it has more of a chance of actually doing something than the first design.
     
     

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    ok thanks, seems like you no you bimmer stuff lol,
    soo m50 intake manifold, and throttle body is needed? or jus the manifold?
    and any idea on the cost of this mod?

    and sorry off topic but must say your car looks pretty nice... identical to mine, except yours has a bigger lump doesnt it? m3? lol, and my alloys arnt black yet
     
     

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