no mate the sanwich plates are very difficult to crack.. they are very thick and have never seen any of them loose their flexibility.
Why dont you just adjust your flow meter ?
Take the top black plastic cover off - usually closed with silicone.
First of all see the contacts inside if they are worn out or gone black ! If so, clean them gently with a kontact cleaner spray and soft cloth.
Then there is the screw on the outside of the flow meter that regulates the CO's. every time you turn that one, you must rev the car up and let the revs sit down before you can adjust again, so you can see the changes in the mixture.
Then there is the sensor of the air flow meter. turn the car off and take the rubber pipe of the air filter off. Open the flap of the air flow meter and clean the pin like sensor with contact cleaner again.
Worst case senario you will need to adjust the stiffness of the flap in the air flow meter. If needed to do so, loosen it by a tooth, two at the max then close the plastic cover with silicone again.
Basically the concept goes like this.
You need an amount of air and an amount of fuel to burn the right mixture.
If you have high CO, that means that you either have too much fuel or too little air !
For our engines you cannot adjust the fuel flow since our fuel regulator is not variable, so you can increase your air flow with the above methods.
By the way, by increasing the air flow you will get higher vacuum as well !
If you dont have the instruments to measure your CO's, have in mind that the standard revs for the 16v should be around 1100 rpm and watch out for black smoke from the exhaust while kicking the throttle down.
Hope this helps