I'm not sure about the Flowmaster on a 4 banger, but the cat, whatever you do, you will need the O2 Sim for it, SES light will come on. It will throw either a "p0140" or "P0141" code. I forget which one it is.
Flowmaster 60 series is made for sport compact cars. You could go with a 40 or a single in/out same side 80

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