Update on the Tires:
These tires are really starting to shine I have about 500 miles on them now. The rear end seems a lot more planted at high speed and the turn in response is great. Toward the end of the NT05's I was able to spin all the way through 2nd on most streets now 2nd gear grabs quite well. I can still spin 1st gear but if I roll into the throttle in 1st the 305's will stick for a really good launch. I want to see how it does at the track but we're hitting triple digits down here in Texas it’s freaking HOT!
On a side note I am able to still drift the Z but it takes more throttle then before which tells me the wider tire is doing its job. And when it does break loose its very predictable. There is also no screeching sounds more of nice quiet howl, it’s a really good tire!