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  • 09-19-2012, 06:20 AM
    Unregistered

    @Claudio Will this replacement work for my 97' e38 740iL???

    hey claudio i need to do this work on my 97' e38 740iL soon will the magnaflow 94006 work on my beamer???


    Quote Originally Posted by claudio512 View Post
    The OE [original equipment] I.D. is required to exhaust gases same rate [Magnaflow part no. 94006]. There is no need to exceed OE specs.









    ... la vendeta dolce!!!
  • 04-20-2009, 11:29 AM
    claudio512

    Thank you for the open cat picture...




    "Keep Right, Pass Left. It's the Law."





  • 04-20-2009, 04:06 AM
    Peter

    Re: Catalytic converter replacement with Magnaflow

    Just to add my 10 cents worth on this ever emerging discussion, I replaced my cats on the 740 some three years ago. The problem was a rattle only, OEM'S were quoted at 5K AUS so i opted for a pair of Magnaflow 94006. easy installation and did not replace the O2 sensors. Have never experienced any problems infact one would never know the difference unless they looked under the car. The car was sold about two years ago and the new owner still keeps in touch with me, he loves the car and has had no problems either with engine performance or any thing related to the exhaust system.
    Oh btw I'm the guy who provided Claudio with the photos of the OEM cat cut open...
  • 03-28-2009, 11:48 AM
    GJH74AU

    Re: Catalytic converter replacement with Magnaflow

    Claudio,

    Thanks for the great posts on replacement cats.

    Two questions: you recommend the 94006's with a 2 1/2" diamter. This is one size bigger than my original pipes (2")on my '98 E38. Per your picture, this enables you to slide the new cat over the existing exhaust pipe.

    Why are most of the pictures missing from the posts? Looking for the picture on cutting out the original cats.


    Thanks,

    Greg
  • 01-22-2009, 03:30 PM
    claudio512

    THERE SEVERAL BMW OE MANUFATURES

  • 01-22-2009, 02:07 AM
    luauboy

    Re: Catalytic converter replacement with Magnaflow

    A quick question for everyone on this thread. Who actually manufactures the OE cats for BMW? Is it a European company? US based? I know Magnaflow is a very popular choice - but heat dispersion (including the OE heat shields) would seem to be a key component of the operational aspect of the sensors, OBD and fuel delivery system, wouldn't it?

    Like DavidC - the 'rattle' has reared it's head - and (1) of my O2's is now 'reporting' erratically. I'd like to make sure that if I replace the cats/sensors and any other 'impacted' exhaust components - that I can at least be assured that if I choose non-OEM - that any other vehicle components that may have been 'specifically' engineered to accomodate heat, vibration, moisture etc ... based on the OE cats -- isn't going to rear it's ugly head at some futre data.

    Thx in advance.

    2K 740i Sport
    Blk/Tan
    140k
  • 11-14-2005, 12:24 PM
    claudio512

    Re: CE Light on with new Magnaflows

    Provide details on your including type of spark plugs and fuel you are using... without details I cannot provide feedback. Also, you mentioned to have replaced O2 sensor a year ago. Here is your link: http://bimmer.roadfly.com/bmw/forums/e38/7213543-1.html




    ... la vendeta dolce!!!
  • 11-14-2005, 11:01 AM
    vladlen1969

    Re: CE Light on with new Magnaflows

    Claudio, the cats are magnaflows 94006 with the i/o 2 1/2". All 4 O2 sensors were replaced about 8,000 miles ago. The O2 sensors were removed prior to cutting and welding process. The plugs were replaced by dealer at 100K service would assume using the Bosch OEM's. I have cleared the ce light (indicating 5-8 cat deficiency) and have driven about 400 miles since without re-occurance.

    97 740iL
    120K
  • 11-12-2005, 12:19 AM
    claudio512

    Re: CE Light on with new Magnaflows

    Which magnaflow model is on the car? It has to be similar specs cat and using other with smaller I.D. [inner diameter] means decreasing or slowing down exhaust flow. The inner diameter should be 2 1/2". How long ago did you replaced O2 sensors? What type of spark plugs are on the engine? I have over 2,000+ miles and no problems and it has been checked at inspection station and passed twice. So, provide complete details to understand problem.


    ... la vendeta dolce!!!
  • 11-11-2005, 08:48 PM
    claudio512

    Re: Catalytic converter replacement with Magnaflow

    Replaced both at same time 2,080 miles ago and no check engine light warning or any other error code. Car is performing great in spite of several trips to Houston and Plano, Texas [I did not see Darth in Plano...]


    ... la vendeta dolce!!!
  • 11-11-2005, 04:41 PM
    vladlen1969

    Re: CE Light on with new Magnaflows

    If you search the archives this issue has come up many times before, and installation procedure was already outlined with the most suitable aftermarket cats for our purposes. The latest posts, thanks to Claudio who added pictures.
  • 11-11-2005, 03:54 PM
    technobuff

    Re: CE Light on with new Magnaflows

    Jim,

    I am having a little bit of a disconnect. How could you have known of the complete procedure if the Claudio's original post on Magnaflow 94006 replacement was dated 11/06/05?

    Please clarify....
  • 11-11-2005, 01:45 PM
    vladlen1969

    Re: CE Light on with new Magnaflows

    All was cut and installed as described, all 4 sensors were replaced about 1 year ago or 7,000 miles..
  • 11-11-2005, 01:38 PM
    technobuff

    Re: Catalytic converter replacement with Magnaflow

    Claudio,

    How many miles have you driven using the Magnaflow 94006 cats? Did the check engine light ever lit up until now? Did you replace both cat? if the answer is no, which did you replace 1-4 or 5-8?
  • 11-11-2005, 01:35 PM
    technobuff

    Re: CE Light on with new Magnaflows

    Jim,

    Did you follow Claudio's detailed instruction on the cut off points on the old CAT, the weld points and additional exhaust piping material welded to the new Magnaflow CAT? Did you install new pre-cat and post cat O2 sensors?
  • 11-11-2005, 11:02 AM
    vladlen1969

    Re: CE Light on with new Magnaflows

    Installed new Magnaflows 94006's one month ago at Meineke (700 miles) CE light came on last night. Checked the code: Cyl 5 - 8 cat deficiency and the saga continues. Nothing beats OEM.

    Jim
    1997 740iL
    120K
    Built 2/97
  • 11-08-2005, 03:29 PM
    claudio512

    Re: Catalytic converter replacement with Magnaflow

    Indeed, O2 sensors can be by passed but it is necessary to use a jumper to dummy a working O2 to other electronic devices up stream. The best Magnaflow match is the 94006, which are 2 I.D., and easily slips on exhaust without modifications. WARNING! It is necessary to use the correct I.D. to void false code errors or check engine light warnings by increasing or reducing back pressure.

    OE cats are the best choice

    Magnaflow 94006 cats are a good choice

    Any other cat... I am not familiar.



    ... la vendeta dolce!!!
  • 11-08-2005, 11:14 AM
    technobuff

    Re: Catalytic converter replacement with Magnaflow

    I have read mutitudes of threads regarding catalytic converter replacement options for E38's but continued to be puzzled in my selection on how to move forward. Let me start first by saying, the OEM is the best option if you have the money to spend or if the vehicle is still under warranty. It was confirmed also in previous posts that oxygen sensor replacement are a must for the catalytic converter that needs replacement to avoid the "check engine light" issue. Make sure that the vehicle has no or major fault codes that would immediately send the "check engine light".

    OBD I recommendation aside from the OEM: I.D. and O.D of exhaust pipe
    DEC Model #
    Approx. Price
    Bolt on
    Magnaflow Model #
    Approx. Price
    Cut and weld
    Miller Model #
    Approx. Price ?????

    Best Recommendation:

    OBD II recommendation aside from the OEM: I.D. and O.D of exhaust pipe

    DEC Model #
    Approx. Price
    Bolt on
    Magnaflow Model #
    Approx. Price
    Cut and weld
    Miller Model #
    Approx. Price ?????

    Best Recommendation:

    Can somebody populate the Model #'s, approx price, best recommendation information to assist fellow members on the best solution to move forward in terms of replacement?

    Can someone also use a Oxygen Sensor bypass on the post O2 sensor to send a signal to the engine management system that everything is running fine?

  • 11-08-2005, 12:28 AM
    claudio512

    Cut-open OE catalytic converter

    The picture provided by Peter C. [Australia...]. To cut open a 4 grinder with 1 mm steel cutting blade was used. According to Peter, It took a couple of minutes and very interesting to see differences between the OE and after market cat types. The OE has 3 solid ceramic brick's about 100mm (4inch) long with spacer collars between and held in place with a steel braid and wrapped with fibrous material that appears to be impregnated with granules of "Gold, as the Magnaflow has only two ceramic bricks of 1 thickness, not sure what the precious metals are? Hoping the information answers a few questions. Thanks mate for providing the picture and info.

    Gday






    ... la vendeta dolce!!!
  • 11-07-2005, 02:23 PM
    claudio512

    Re: Catalytic converter replacement with Magnaflow

    Never... familiar by work experience.


    ... la vendeta dolce!!!
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