Im not 100% on the suspension,I can't see it being too bad tho.
It depends, for the best job you should take them off, they can be done on the car but make sure they take out the 02's first and make sure they are very thourough. There are little steel wool rings in there that would spell disaster if they got sucked up into the engine.
The problem with the Contour is the cats are right in the manifolds (headers). dead cats was an easy prob to fix on the SHO.
