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Thread: The difference between a petrol and diesel exhaust box

  1. #1
    Ex-Staff Full Member John LE's Avatar
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    Vehicle : Facelift Insignia/Corsa D

    Trim : LE/VXR

    Engine : 2.0 cdti/1.6 Turbo

    Year : 13/07

    Default The difference between a petrol and diesel exhaust box

    I have just purchased an irmscher back box for my car. It came from a 1.8 petrol (mine is a 2.2 diesel) so I know that I will have to get the old entry pipe cut off and a new one welded on but will the internals of the box be different?

    I know that the irmscher boxes are free flowing anyway but will I need to split the seam and remove the internals of the box or should it be ok?

    Any comments appreciated

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    Regular Member signumboy's Avatar
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    Vehicle : Signum

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    got me on that one John ...havent a clue ...why not try it first then take it from there ?

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    Regular Member Ademusic's Avatar
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    Funnily enough I thought the same thing today about normal back boxes...is there much difference between diesel ones and petrol ones? Sorry if i'm being thick..

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    Regular Member P3tchy's Avatar
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    Petrol ones (standard) have more baffels in them to deaden the sound, Diesels ones don't as far as I know.

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    Ex-Staff Full Member John LE's Avatar
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    Vehicle : Facelift Insignia/Corsa D

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    Quote Originally Posted by P3tchy View Post
    Petrol ones (standard) have more baffels in them to deaden the sound, Diesels ones don't as far as I know.
    Thats what I thought mate, don't know if it would mess up my cars breathing. The irmy back boxes are naturally less baffled anyway so just hoping it would be ok. May just have to get it on a r/r after its fitted to see if it has restricted it

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    Regular Member P3tchy's Avatar
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    I think the Irmy boxes are the same fitted to both petrol and diesel. It may just be the standard road box thats different.

  7. #7
    Regular Member ditchp's Avatar
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    Vehicle : Vectra cdti estate

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    vxr boxes go onto a diesel, and although IRMSCHER wouldn't sell me some for a 2.8 turbo petrol as they were going on a diesel i can't see there being a problem other than bore size at entry..

    HTH
    Midlands Mod Shop - NFFC.

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    Ex-Staff Full Member John LE's Avatar
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    Vehicle : Facelift Insignia/Corsa D

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    Yeah but with the VXR exhausts there are two mate, its just the left hand exit that I have.

    With the VXR's it wouldn't matter if they were more restrictive as the gases would be split between the two, if you know what I mean

  9. #9
    Regular Member ditchp's Avatar
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    Vehicle : Vectra cdti estate

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    see what you mean mate, not 100% certain but thinking about it did ben aka BIG MAN fit a petrol box to his dti ????
    Midlands Mod Shop - NFFC.

  10. #10
    Regular Member ditchp's Avatar
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    Vehicle : Vectra cdti estate

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    dont know if it's a petrol or diesel box but here is a pic of how it looked...

    http://www.vectra-c.com/forum/showthread.php?t=37870
    Midlands Mod Shop - NFFC.

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