IMO, the straight line acceleration in my 3P+ is fantastic up to around 80 mph, then it's just ordinary. My old 1991 300ZX-TT would power on to 120 or so. Those speeds are so rare that it's basically a party trick. The 0-60 range, hell, I use it all the time and there is no comparison to anything other than a Performance S (which is jarring at launch).
One thing, and I don't know if I'm just getting old or what, is that I don't feel as confident on twisty roads in my 3 compared to the old Z. Back in the 90s I drove my Z up in the mountains of north GA and had a blast. The section of US19 from US129 to Vogel State park, in particular. Very twisty and the road is significantly banked into the curves. Did the same last weekend in my 3P+. Now, I was in a pack of around five vehicles (two pickups!, a motorcycle, and some sort of BMW 3), so the spacing and lane discipline was a concern. Anyway, the BMW came up on me aggressively early on so I decided to test out my 3. The BMW would kill me in the curves. I can't put my finger on it but entering a curve in the 3 doesn't seem as solid as my old Z. It feels like the front is "light" and will break free on entry. It didn't matter in the end because I killed them on the short straight segments and exited the pack well ahead of the BMW. My wife was with me and said we averaged around 50 mph (obviously, slower in the hairpins but fast in the straights).
Get the MPP sport coilovers. Crank the shocks up a couple of notches. You'll torch the BMW.