I always wanted to ask this question, but I keep forgetting. People have alwasys said that the 370z is a better track car. Having driven both the 135i and 370z, I also felt that the handling on the 370z was better. (Terrible car to live with for a DD)
I was initially going to buy the 370z, but after I drove the 135i, there was no competition. Also, I got my fully loaded 135i for a price lower than what a similarly equipped 370z would have cost!
But, as you can see from the videos below. On Laguna Seca, Randy Pobst posted a lap time of 106.0 secs with the 135i and 106.5 secs with the track ready 370z NISMO. What gives?!