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Thread: Question on exhaust for '79 733i

  1. #1
    Join Date
    Jan 2006
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    West Newton, MA
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    1999 M Coupe, 1999 528iT

    Question on exhaust for '79 733i

    Hey, folks, I'm considering buying a '79 733i. It is a de-reactored car (headers) that needs an exhaust front-to-back, and I'm trying to get a handle on price and options.

    I see that there are some ANSA Euro 733i exhaust pieces available on both eBay and Bavauto at good prices. RealOEM seems to verify that they're for an early Euro car. They certainly have different part numbers than the US-spec pieces. Does anyone know what the difference is? I thought that a US-spec early 733i like a '79 had reactors but no cat and no oxygen sensor. I'm not sure why there should a difference between what bolts onto the downpipes between the Euro and US-spec cars.

    Thanks.

    --Rob
    Personally inscribed copies of my books available at www.robsiegel.com
    1972 2002tii x2
    1972 Bavaria
    1973 3.0CSi, 1979 Euro 635CSi
    1999 Z3M Coupe, 1999 Z3
    2003 530i stick sport
    1974 Lotus Europa Twin Cam Special (I know, I know...)

  2. #2
    Join Date
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    E21/early e23/e34
    I have the same car, ('79 733i cat delete) and ended up using M30B35 exhaust manifolds (I removed the thermo reactors which are death to early heads) and a custom 2.5" exhaust using a Magnaflow muffler and resonator, kept the same routing, there's a short build thread on it-

    Looks good, sounds good and engine breathes much better- pulls stronger and I find I don't have to downshift nearly as much as before when I slow down.


  3. #3
    Join Date
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    Quote Originally Posted by kojo96 View Post
    I have the same car, ('79 733i cat delete) and ended up using M30B35 exhaust manifolds (I removed the thermo reactors which are death to early heads) and a custom 2.5" exhaust using a Magnaflow muffler and resonator, kept the same routing, there's a short build thread on it-

    Looks good, sounds good and engine breathes much better- pulls stronger and I find I don't have to downshift nearly as much as before when I slow down.

    Kojo96, what model exhaust are you using. Thanks

    Sent from my HTC6545LVW using Tapatalk

  4. #4
    Join Date
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  5. #5
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    1983/84/85 745i

    Thumbs up

    ANSA = SHIT just so you know.
    I make E23 parts.
    09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
    10/1984 745i
    11/1984 745i
    11/1984 735i (10:1-265/6)
    Ford, MB, and GM round out the pack.



  6. #6
    Join Date
    Jan 2006
    Location
    West Newton, MA
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    1999 M Coupe, 1999 528iT
    Thanks, folks, appreciate the advice. I am curious, though, if anyone knows the answer to the specific question I asked -- what the difference is between a Euro and a US-spec exhaust for an early (reactor) car.

    --Rob
    Personally inscribed copies of my books available at www.robsiegel.com
    1972 2002tii x2
    1972 Bavaria
    1973 3.0CSi, 1979 Euro 635CSi
    1999 Z3M Coupe, 1999 Z3
    2003 530i stick sport
    1974 Lotus Europa Twin Cam Special (I know, I know...)

  7. #7
    Join Date
    Mar 2013
    Location
    USA
    Posts
    465
    My Cars
    E21/early e23/e34
    I can't imagine much of a difference if any on EU cars vs US spec cars, but I'm not the expert/ Maybe Kieth will chine in, he has a data base in his head it seems like for stuff like this.

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