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try searching but cant find a guide on how to change your decat back over to standard cat or vise versa, just as its m.o.t time and i no its a pain in the backside to do, can anyone point me in the right direction?
It's just like for like replacement if your still using the standard 172 manifold.
The old pipe unbolts (if it's rusted, grind it off) and then refit with new bolts if possible as they rust.
A manifold to cat section fitting kit can be bought from renault or ktec and i would recommend it if your bolts are corroded.