I was pleasantly surprised how well the 170 drives when I got mine. I was very worried I wouldn't like it, and for what it cost LOVE it, but figured I could sell it if I hated it.
It drives better on the street than my Hellcat did, and is faster and easier to go faster at the track. Kinda crazy honestly.
I've got Michelin PS4 tires on the back of mine, I can't remember the size but I think they're OEM on some Porsche SUVs. It hooks SHOCKINGLY well and the traction control programming seems a lot more advanced than it did in my Hellcat. I see Mr. Squiggles blink here and there at WOT but I never "feel" it lose power like I did in the Hellcat. I asked Jim Wilder about that and he said "the calibration engineers worked a long time on that".
I've not noticed the gears holding a higher RPM.....maybe I thought it's due to the 3.09 gears. 4,000 miles on mine now.