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Thread: Reason for twin exhausts

  1. #1
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    Question Reason for twin exhausts

    (Not really a tuning question but it seems the closest category...)
    Hi everyone,

    On the Holden Vectra CDXi/Opel Vectra GTS/Vauhall Vectra SRi, there are twin exhaust pipes out the back. Are these just for looks or do they improve the engine performance? From what I can see, the same output figures are quoted for the single exhaust and twin-exhaust versions of the car.

    Thanks.

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    [Ex]Admin Duncan's Avatar
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    As far as I was aware, it's purely a cosmetic thing.

    D

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    I agree with Duncan mate, unless you're going for a Stainless Performance system etc.

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    It halves the emissions......as long as they can only measure one pipe at a tme.

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    Agree with the other comments, it's just for cosmetic reasons - the pipes are only split just before the back boxes anyway, so it's a pretend dual system. A 'proper' dual exhaust - i.e. with separate headers from each bank of cylinders and separate pipes running all the way to the back may make a slight difference to the horsepower, but unlikely to be significant. As far as I know, you don't actually need separate pipes for a 6 cylinder engine to maximise performance and with the 4 cylinder moters, there's even less point.

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    Thanks everyone

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    unless the system is a proper twin header twin pipe deal then having twin pipes at the rear is actually performance reducing because the split messes up the gass flow and would creat back presure.

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    Quote Originally Posted by POAH
    unless the system is a proper twin header twin pipe deal then having twin pipes at the rear is actually performance reducing because the split messes up the gass flow and would creat back presure.
    hey, i was planning for a split twin pipe exhaust mod, but after reading yr post, it make sense, so i'll stick to one side then.

    Cheers

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    No performance decrease when I fitted my Irmscher twins. Infact felt pickup slightly quicker.

    But a poor designed system could decrease power.

    The Vectra's don't produce enough power to worry too much about back pressure. Only over 300bhp do you really need to start getting concerned massively about exhaust diameter size, backpressure etc. etc.

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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    By effectivly doubling the volume of the pipe, the pressure would theoretically increase but the mass flow should be the same so you shouldn't see back pressure or a performance drop. Unless they bodged the join and created a bottle neck.

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