According to Motor1, the refreshed Z will get some mechanical updates too, including a re-tuned suspension with new shocks, and what sounds like braking upgrades for both the standard Z and Nismo models.
https://www.thedrive.com/news/confirmed-nissans-refreshed-z-will-come-to-america
1. Love the color and wheels.
2. About time they made the sport brakes STANDARD. Two-piston calipers belong on SUVS and sedans--not a sports car.
https://www.motor1.com/news/783937/nissan-z-facelift-japan/
It's your exhaust. My Motordyne Shockwave exhaust makes fluttering pops on deceleration/downshifting. Since I replaced the cats with Kinnetix High Flows, they occur more frequently and sound deeper.
I have Toyo Proxies 4 Plus all around on my '09 370Z
I'm running Toyo Proxes 4 Plus all-seasons on my '09 370:
245/35/20 on 20x8.5 TSW Tabacs front
295/30/20 on 20x10 TSW Tabacs rear
I've had the Proxes for awhile now. They're fairly quiet, grip well year round and have excellent tread life.