Hi Caneman, yes I originally went to StopTech OEM replacement slotted rotors but had no improvement over OEM. I was having a lot of inconsistent behavior from the stock brakes under hard auto-x driving, and because I decided to upgrade it to a full track car I wanted to upgrade the brakes to something reliable. Stillen is currently the exclusive US distributor of the AP Racing kit for the Z, I bought them during the sale last Thanksgiving. I installed them a couple of weeks ago and did a test drive today but it's still too cold to really put them to the test. I would say save your money, don't bother with OEM rotor upgrades for the Z. Also the Z OEM won't fit the Titan.

Just wondering looks like you did a OEM rotor upgrade than about 8 months later you upgraded with AP wich looks great BTW.Do you track your Z or just were not happy with the OEM upgrade.I thinking of doing something with my Z I have a 07 Titan that needs brakes front rotors warped so my idea was upgrade the Z and use the Z OEM on the Titan.So I guess the question is did you notice a big difference with the AP upgrade and where did you buy them Stillen?