I got a 'direct replacement' catalytic converter to replace my current one, since Im getting a P0420 code. The size of the replacement cat and the size of my exhaust manifold are different. I have a 03 GT and the flange is bigger than the new pipe. Gasket is even way bigger. Question is, are the exhaust sizes different on a 1zz and a 2zz? Im assuming the GT has a larger diameter pipe? It was listed as fitting all vibes, base and GT.
I have an O2 sensor that no one else seems to have. Theres the one between the 2 cats and then one after the last cat and before the resonator. See picture.