Do not 100% trust tire rack on the tires they spit out, you can adjust it slightly on size and such. Just do some searching (here & Google) for a tire calculator and you will see what changes in size/width/etc.
Well, 18" v. 19" usually comes down to weight & rotational mass, but that is basically if you plan to track the car. Even then, a 19" might be the better route because of a BBK fitment issue with smaller wheels.
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