well is that all you need is that kit and your good????

or do you have to get other things so that it levels out and such

 

z htechs drop the coupe about .8" up front & .7" in the rear. you can get a better drop by cutting the rear spring mounts, but you'll definitely need a rear camber & toe kit. see this thread for more info:
https://g35driver.com/forums/brakes-...w-updates.html

also, you can get z htechs for +$75 used in the Marketplace.

 

i'd recommend a rear camber kit (at least), but that's up to you. You'll need to have the car aligned after you install the springs. I'd plan on doing two alignments - one a few weeks after the install and another a few months later.