Hi I'm looking to replace my cat on my 1.2. I've removed the old one but looking in the Haynes manual it says that when I undo the exhaust pipe the down pipe end (below the bulk head) I'm to "recover the gasket^ however when I removed it, it didn't seem to have one. Is there supposed to be one there? It's quite rusty so it's possible that there could've been one there but it just corroded away