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Thread: to decat or not to decat a gsi - is it worth it?

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    Regular Member TimTay's Avatar
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    Default to decat or not to decat a gsi - is it worth it?

    as the 29th of jan very slowly aproaches for my new exhaust im stuck weather to decat it or not. so got a couple o question guys.

    1 - am i going to see any really noticable performance gains?
    2 - will i fail an mot? even with the other 2 pre cats?
    3 - am i going to blow windows out when driving up my local highstreet with increased noise?
    4 - shall i just keep it in?

    Cheers.

    oops forgot to mention any extra fuel consumption?

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    Full Member Big Sig's Avatar
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    If you search you will see it's already been done and all of your questions answered. Gsi3.2 started a thread ages ago as he did it to his.
    Now I need a turbo to keep up!

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    Regular Member TimTay's Avatar
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    sorry,

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    Full Member Big Sig's Avatar
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    Now I need a turbo to keep up!

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    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

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    Quote Originally Posted by TimTay View Post
    1 - am i going to see any really noticable performance gains?
    2 - will i fail an mot? even with the other 2 pre cats?
    3 - am i going to blow windows out when driving up my local highstreet with increased noise?
    4 - shall i just keep it in?

    Cheers.

    oops forgot to mention any extra fuel consumption?
    1. My GSi auto became more "driveable" below 3k rpm.
    2. No - my emissions stayed exactly the same.
    3. No - slightly more throaty sound but hardly anything.
    4. No.

    MPG - same.

    HTH

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    Regular Member hagga's Avatar
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    as above

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    Regular Member TimTay's Avatar
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    cheers

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    Regular Member Hyperhart's Avatar
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    Vehicle : Astra GTC VXR

    Trim : VXR

    Engine : 2.0t

    Year : 2013

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    Just thought i'd add my bit, my GSi was MOT'ed 2 weeks ago at my local Vauxhall dealer and passed with flying colours and i've had it de catted. If your unsure if it will pass the emissions use some Cataclean (i put a bottle in just to be on the safe side).

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    Regular Member TimTay's Avatar
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    Quote Originally Posted by Hyperhart View Post
    Just thought i'd add my bit, my GSi was MOT'ed 2 weeks ago at my local Vauxhall dealer and passed with flying colours and i've had it de catted. If your unsure if it will pass the emissions use some Cataclean (i put a bottle in just to be on the safe side).
    that sounds like a valueble bit of infomation will keep that in mind, cheers

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