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I'll pass on what my dealer said... I'm sure this isn't the only opinion out there so take it for what it is worth.
The driving instructors at their local track recommend 18" wheels and no PASM. On very good surfaces such as track driving 19" wheels offer clear benefits. On the street, where the quality of roads is more hit and miss 18" wheels are able to maintain better contact across a wider variety of surface. The larger sidewall acts as a shock absorber and keeps the grip more even. The car I bought used originally had 19", but the first owner swapped them out for 18".
My personal take is that the handling with 18" is outstanding. 19" may be better in some circumstances, but I prefer not to pay the extra cost for 19" every time the tires need replacing. Price it out at Tire Rack. It's not just a few more bucks.
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