IMO 19 or 20 on the Z looks very similar depending on how you drop the car. 19's with the car super low is the perfect look. But the 20 wheels look just as nice with a little more ride height. So really just depends if
1. you can functionally go low enough to make 19's work
2. you like the look of the car that low to make the 19's tuck nicely into the fenders
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