Are E36 exhausts interchangeable?
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  1. #1
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    Are E36 exhausts interchangeable?

    Coming from the Vectra world all exhausts would fit (centre back) apart from the 1.6,

    Is it the same in the BMW world?

    Would an exhaust backbox off say a 328 bolt straight onto my 320?

    The exhaust will be my next mod so I want to start looking into it just now ,

    Thanks in advance

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  2. #2
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    not completely.

    318, 320, 323 are single pipe to backbox

    325, 328, m3 are twin pipe to backbox, also m3 is different to 328 i believe.

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    Quote Originally Posted by stickle View Post
    not completely.

    318, 320, 323 are single pipe to backbox

    325, 328, m3 are twin pipe to backbox, also m3 is different to 328 i believe.
    Thanks mate, that's what I needed to know, I've seen a few pictures of twin pipes and backboxes with single pipes so I wasn't sure what was what

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  5. #4
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    Quote Originally Posted by stickle View Post
    318, 320, 323 are single pipe to backbox
    Not to mention that 320 upwards are 6 cylinder and 318 is the odd ball
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    On your 320 a 323i backbox is a direct fit. 325 exhaust will fit from the manifolds back but you will need the 325 cats and backbox. 328 cats and rear box will fit but if yours is an M50 engine you will need a Y pipe welding in for the lambda sensor.
    M3 exhaust will fit but its not easy as you need the m3 manifolds and a y piece welding in again for the lambda.

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  9. #6
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    Quote Originally Posted by e36coupe-328 View Post
    Not to mention that 320 upwards are 6 cylinder and 318 is the odd ball
    Quote Originally Posted by Steve View Post
    On your 320 a 323i backbox is a direct fit. 325 exhaust will fit from the manifolds back but you will need the 325 cats and backbox. 328 cats and rear box will fit but if yours is an M50 engine you will need a Y pipe welding in for the lambda sensor.
    M3 exhaust will fit but its not easy as you need the m3 manifolds and a y piece welding in again for the lambda.
    It's mostly the pipes to the backbox I was unsure about, I can make anything fit , when the CAT does go I'll look into bigger and better.

    Just need to look and see what tailpipes I'm going for, need to get some photoshopping done lol

    Sent using the force

  10. #7
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    Just get a complete 328 system and be done
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    Quote Originally Posted by e36coupe-328 View Post
    Just get a complete 328 system and be done
    Still needs a y piece welding in for the lambda if its an m50 engine. 325 system is a straight fit.

  12. #9
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    Quote Originally Posted by Steve View Post
    Still needs a y piece welding in for the lambda if its an m50 engine. 325 system is a straight fit.
    Or weld the threaded boss for a lambda into the X piece on the 328 exhaust (which is the same size as a nut that fits a spark plug if I remember rightly.
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    Quote Originally Posted by e36coupe-328 View Post
    Or weld the threaded boss for a lambda into the X piece on the 328 exhaust (which is the same size as a nut that fits a spark plug if I remember rightly.
    No good because the x is after the small cat. Needs to be before. The 325 cat section has the x pipe ready in front.

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