Recently bought a 2019 GT3RS, I'm very curious what this car could do, so after few adjustments and here's a lap around the ridge. 

Wing adjusted to full attack mode.
Front sway bar middle, rear sway bar stiff.
Front & rear camber to the max both around 2.1
Front tire 265/35/20 Cup 2 N2, 30 psi hot.
Rear tire 325/30/21 Cup 2 N0, 30 psi hot.
Car came with a set of HRE RC103 wheels.
Car came with a full titanium exhaust from ipe.

This is the flying lap of the second session, I noticed cup 2 is only fast for one lap, and then it's nowhere near fast. Later in the day did 1:42.54 and last session was a 1:42.64 with a 1:41.76 optimal on Garmin. With more seat time and a clean hot lap can definitely get into high 1:41s. 

Pretty shocked what this car could do considering it's pretty much all stock and Porsche gives full warranty for it. Will be back with better tires next time.

Also AC was on the whole time, lost 0.1 seconds for sure ^^