I'm looking at buying an S-Type that's had a few problem, but I think I could flip it for the right price. However, the current owner has taken the catalytic converters off and there's no MOT on the car, so I need to put some on to get it to pass. I cannot for the life of me find catalytic converters for the S type 4.2L anywhere. Is there a decent priced converter anywhere for these things?