I have an '04 X which I'm buying 19's for soon. I'm sure I'd need a drop, and I think the un/revised Z springs are pretty good here. Question is, what's the difference between revised and unrevised? Is one better than the other for the X, or better than the other in general?

 

https://g35driver.com/forums/brakes-suspension/65190-g35-350z-aftermarket-coilover-springs-shocks-spec-s-w-updates.html

But to put it in quick terms. The unrevised would be good because the revised is stiff since we don't have the sport sup. But if you get say Koni Rear shocks the revised shouldn't be a problem.