best exhaust for a e36 m3 evo ?

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  1. best exhaust for a e36 m3 evo ? 
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    Am after some technical info. . Am having an exhaust made for my m3 but not quite sure on the best size etc for maximum performance and a nice noise. Have most things sorted, just need too know the best pipe diameter for the middle section (manifolds too backbox) ? thanks.
     
     

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    Can anybody assist the OP ?
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    The only thing I know is that most people have 2-2.5 inch piping to make up the whole system

    I cant give you a detailed explanation why but I know its the better bore diameter for performance and sound for you engine size.
     
     

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    I think the M3 has a 3 inch bore as standard and tbh I don't see the need to alter that. 2.5 inch is a general compromise on flow rate vs back pressure. This means the gases can flow out quickly without causing too much back pressure. However, a 2.5 inch bore is used on lower capacity engines and as the M3 is a 3.0/3.2 you'll need to go slightly bigger.

    If the exhaust you're having built is custom, make sure it is mandrel bent so the pipe is the same width all the way along as some custom exhausts are bent so the bore is smaller at any corners and therefore restricts flow.
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    how much is it costing you?
     
     

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    Quote Originally Posted by Prince View Post
    I think the M3 has a 3 inch bore as standard and tbh I don't see the need to alter that. 2.5 inch is a general compromise on flow rate vs back pressure. This means the gases can flow out quickly without causing too much back pressure. However, a 2.5 inch bore is used on lower capacity engines and as the M3 is a 3.0/3.2 you'll need to go slightly bigger.

    If the exhaust you're having built is custom, make sure it is mandrel bent so the pipe is the same width all the way along as some custom exhausts are bent so the bore is smaller at any corners and therefore restricts flow.
    I think you're confusing back pressure with scavenging effect..

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    * 2016 BMW M135i LCI (F20): current
    * 2016 Mercedes Benz GLA 200d AMG Line (X156): current
     
     

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    go to big and you will kill it 2.5 is easily enough!
     
     

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