Wow thanks guys for so much input! I reached out to an organization called Speedventures who host track days all over CA. They took a look at the "roll protection" (lol) the 370Z Roadster has and they allow it.
All I plan I doing is installing a Stillen Intake and Exhaust. Hopefully the little extra boost in HP helps overcome the weight gain.
Lets hope I don't fall in love with the new Z coming out soon more then then 370
