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Thread: Pre Cat?

  1. #1
    Regular Member rushy's Avatar
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

    Default Pre Cat?

    Seen alot of talk about a "pre cat" and its removal. What is it, What does it do and is it worth removing it on a 2.2 petrol for more horses?

  2. #2
    Regular Member rushy's Avatar
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    Vehicle : SRi


    Engine : Z22SE (2.2 Petrol)

    Year : 2004

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  3. #3
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    hi mate a pre cat is just a cat befor the main cat. removing should free a couple of bhp if you have a perfomance exhaust.

  4. #4
    Regular Member Gsi3.2's Avatar
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    IIRC, it's all in the same housing, just after the 4 into 1 exhaust junction, beside the bulkhead.. there is no cat under the car on the 2.2's... to remove the pre-cat will require you to cut open the can and re-weld it ..

    i'd give it a miss personally..

  5. #5
    Regular Member Ride-On!'s Avatar
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    Will only give you a few extra horses.

  6. #6
    Regular Member rushy's Avatar
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    Engine : Z22SE (2.2 Petrol)

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    Welding mmm, think ill give that a miss. Thought it was just unbolting the pre cat pipe drilling holes around edge of the honeycomb then chissle it out, then replace pre cat and away toy go?

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    Regular Member Gsi3.2's Avatar
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    as i said, IIRC it's a one -piece sealed unit with the main cat.. you could knock it out but you'll have to give up getting it mot'd..

    you could try a sports cat if you wanted, but the gains per pound are minimal..just get it mapped

  8. #8
    Regular Member rushy's Avatar
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    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

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    Penny dropped, got you. O well thought id stumbled across a free mod.

  9. #9
    Regular Member dinac_cro's Avatar
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    it is a bit old topic , but maybe some1 need this again

    http://www.astraownersclub.com/docum...precat-z22.pdf

  10. #10
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    rushy you been looking on the z22se web site? its only on the vectra bs has a pre cat off the manifold, then the cat under the car. our cat is off the manifold, so dont we dont have a pre cat

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