Unfortunately if u have the sports brakes you can not run anything smaller than an 18 inch rim in order to clear the calipers/brakes....
Othets are right...there is a small bunch whom drag race their 370Z's....The drag radials I hear give a lot of wheel hop.
Im not sure if the 19" MT Drag Radials II are any better...here is a past thread discussion about it.
Drag radials for stock sports wheels?