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?? You said "I prefer the 16" for looks but mostly for performance. The tossability of the car changes with the increased grip the wider tires/wheels add. I love being able to kick out the rear at-will. "
You really shouldn't see much difference between 17" AP2 & Michelin PSS in OEM sizes versus 16" AP1. The AP2 setup is a few pounds per wheel heavier, but that small of a difference won't cause the car to kangaroo.
I've found the S to be a lot more sensitive to tire diameter than tire/wheel weight. Not many tires match the diameter/rollout of the OEM tires, and basically no tires match the OEM widths if you're trying to maintain the stock stagger.
There are free apps that you can use to check your actual speed. I use this one:
