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Thread: Double walled exhaust system?

  1. #1
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    Double walled exhaust system?

    My exhaust system is rusted and mangled from previous repairs so it will be replaced. When hacking it off I find double walled pipes! It's the sections just after the downpipes.

    Is this original and standard?

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  2. #2
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    Doesn't look like oem. Didn't look like that in my 94

    Time to bin your cat too. Ask me how I know

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    Last edited by f13platform; 05-18-2019 at 11:13 AM.

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  3. #3
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    Thank you!

    Yes the whole system will be replaced. I found remnants of the cat on the rear lambda sensor so I know they are completely blown

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  4. #4
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    Quote Originally Posted by buildit View Post
    Thank you!

    Yes the whole system will be replaced. I found remnants of the cat on the rear lambda sensor so I know they are completely blown

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    You can tell from level of welding skills it was done cheap. Time to set it right
    What box you thinking?

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  5. #5
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    You can go loud if you wish lol
    https://youtu.be/pzJN21iRM78

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  6. #6
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    Quote Originally Posted by f13platform View Post
    You can tell from level of welding skills it was done cheap. Time to set it right
    What box you thinking?

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    At the moment I'm dismantling the entire car so I have no idea what system I will put back on. The eisenmann does sound nice but perhaps a bit lound if driving longer distances

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  7. #7
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    Quote Originally Posted by buildit View Post
    At the moment I'm dismantling the entire car so I have no idea what system I will put back on. The eisenmann does sound nice but perhaps a bit lound if driving longer distances

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    I get used to this now but you right this could make some people crazy )

    What's a plan for your car? Mini or full restoration?

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  8. #8
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    Complete ground-up restoration

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  9. #9
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    Quote Originally Posted by buildit View Post
    Complete ground-up restoration

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    Yeahhhh )


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  10. #10
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    Definitely BMW OE..
    The pre-Cat double wall exhaust pipe is an emissions upgrade to the E31 with M73 engine (1995 production onward) I'm sure it will also be part of the E31 with M62 V8 engines.
    The double wall pipe insulates the inner pipe carrying the hot exhaust gas and helps get the heat to the cats.

  11. #11
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    Quote Originally Posted by m6bigdog View Post
    Definitely BMW OE..
    The pre-Cat double wall exhaust pipe is an emissions upgrade to the E31 with M73 engine (1995 production onward) I'm sure it will also be part of the E31 with M62 V8 engines.
    The double wall pipe insulates the inner pipe carrying the hot exhaust gas and helps get the heat to the cats.
    I have early car with m60. I didn't have that
    No wonder why sound totally different compared to m62 even when it was standard. Every day you learn something new )

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  12. #12
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    Quote Originally Posted by m6bigdog View Post
    Definitely BMW OE..
    The pre-Cat double wall exhaust pipe is an emissions upgrade to the E31 with M73 engine (1995 production onward) I'm sure it will also be part of the E31 with M62 V8 engines.
    The double wall pipe insulates the inner pipe carrying the hot exhaust gas and helps get the heat to the cats.
    Are the downpipes the same?

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  13. #13
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    CSi pipes are like that too, OE for sure. It is a noise dampener design.

  14. #14
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    Quote Originally Posted by buildit View Post
    Are the downpipes the same?

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    Headers and down pipes. See functional description on pages 22 & 23 in the M73 Tech Brief in the link below.
    http://www.exx.se/techinfo/docs/bmw_...nformation.pdf
    Last edited by m6bigdog; 05-18-2019 at 05:26 PM.

  15. #15
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    No double wall on my Euro 97 M62.

  16. #16
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    Quote Originally Posted by e31gixxxer View Post
    No double wall on my Euro 97 M62.
    I think it was some California regulation
    I never see this in Euro cars.
    Very new to me

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  17. #17
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    Quote Originally Posted by buildit View Post
    At the moment I'm dismantling the entire car so I have no idea what system I will put back on. The eisenmann does sound nice but perhaps a bit lound if driving longer distances

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    I had eisenmann race rear boxes in my M70 and they werenít loud at all. Driving at highway it was pretty much like oem. Actually i was a bit disappointed because i thought they produce more sound. I think F13ís car has an x-pipe too?

  18. #18
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    Quote Originally Posted by mikae31 View Post
    I had eisenmann race rear boxes in my M70 and they werenít loud at all. Driving at highway it was pretty much like oem. Actually i was a bit disappointed because i thought they produce more sound. I think F13ís car has an x-pipe too?
    Mine is full custom made apart from back box. Yes I have super sprint x pipe with race cat. + legendary M60

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  19. #19
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    Beware, double-wall construction.
    No one could have thought up a more effective rust incubator.

  20. #20
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    Quote Originally Posted by f13platform View Post
    Mine is full custom made apart from back box. Yes I have super sprint x pipe with race cat. + legendary M60

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    Yes, i thought you had more than just rear boxes. Because of your strongly modified exhaust system your car isn’t a good example of what eisenmann race mufflers sound. Like i wrote, i had those rear mufflers also, and rest of the exhaust system was stock and it wasn’t loud at all! It was pretty silent.
    Last edited by mikae31; 05-20-2019 at 10:43 AM.

  21. #21
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    Quote Originally Posted by mikae31 View Post
    Yes, i thought you have more than just rear boxes. Because of your strongly modified exhaust system your var isnít a good example of what eisenmann race mufflers sound. Like i wrote, i had those rear mufflers also, and rest of the exhaust system was stock and it wasnít loud at all! It was pretty silent.
    Well if you have these distracted double wall pipes fitted to USA car I'm not surprise. You also need to remove silencer too other wise it's just a back box really


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