catalytic converter replacement help
OK, so I need to replace a cat and am not sure which one I need. From what I can tell from being under the vehicle, there are 2 cats off of each exhaust manifold with oxygen sensors after them, then there's another cat or resonator further down the line without a sensor after it. I need the cat that's on the back bank. I don't want to pay the $500+ Lexus or an auto parts store wants. Just wondering what my options are on this and if I can go through somewhere like RockAuto to get one, part numbers, etc. All help is greatly appreciated. Thanks.