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Thread: Manifold Question???

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    Regular Member amar's Avatar
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    confused Manifold Question???

    I have a 2.2 sri.... The manifold appeas to have the cat built in... Question is can I change this to any sports type or fit a different manifold... if so whatdo i do with the two lambda sensor wires???

    Anyone done this?

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    Regular Member Vid's Avatar
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    Yeah, I have! Check this thread out...

    http://forum.vectra-c.com/showthread.php?t=45412

    Any questions mate just ask!

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    Regular Member amar's Avatar
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    looks great... prob is i have two lambda sensors... one before and one after the cat... how will they be installed i see that the cat is now under your car as in most cars...

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    Regular Member Vid's Avatar
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    Mine was the same setup as yours was, with the lambda before and after the cat, all in the downpipe.

    Both of the lambda wires' had to be extended to be fitted before and after the new position of the cat.

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    Regular Member Vid's Avatar
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    You will need to bear in mind though that there is no flange to unbolt the cat from above, only beneath it, so you would need to get a downpipe and manifold from a veb-b or astra if you plan on fitting a cat underneath.

    There are other types of cat you can get, but would be tough to fit in the downpipe tunnel?

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    Regular Member amar's Avatar
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    sounds complicated.... what were the gains like? is it worth the hard work?

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    Regular Member Vid's Avatar
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    I felt the gains straight away, but to be honest it is probably because of my other mods I had already done, that helped the improvement, as they compliment each other. To me it was worth it. I can't say whether you would get any beneficial improvement by just relocating the cat and replacing it with a higher flow one.

    And I am planning more mods too, so it depends how far you want to take it as to whether you think it will be worth it!

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