Yes with the PT67. I don't know how much power the setup makes, but I was trapping mid 120s. Power wouldnt affect the launch much anyhow on a 5spd, turbo size would however. I ran the 26x11.5 et street with radials upfront and the car was plenty stable and 60' in the 1.6s as well. I don't think you should really sweat the skinnies on a high 11 second or low 12 second car, but people have varying opinions on that, so do this at your own risk. I ran my truck to 9.40s on radials and that felt stable too, even when I had to make some corrections after some wheelspin.
The nitto is really my least favorite DR and the 17" rim isn't helping you, but I still wouldn't be blaming the tire, you should still be able to get 1.7s out of that. Like I said though, if the dif needs work, you only have half the tire you think you do. I know when my dif was ready for servicing the car would drop to a 1.7 and kick a hair to the side when I would let the clutch out like clockwork.
