Looking To Do 18's...What Springs?
 

So im gettin ready to buy some wheels soon. I was thinking of going with the Work CR KAI, or the XD9 in 18", with a 255/35 front and a 285/35 rear. I dont know what drop I should run tho....I am pretty sure im going to have to run at least an 1 1/2" to 2 inches. any ideas or suggestions?

i'd highly suggest 255/35 and 275/35. With lower profiles, if you're going for a good look, a bigger drop is needed. I'd aggree with 1.25''. Try Swift srings. They drop low and still ride decent i hear.
Im going to stick w/ 245/40 in the front and change the rear to 275/35 and upgrade to tokiko springs/shocks. That'll give me a decent ride and good handling and balance i think.

Tanabe GF210's
245/40/18 and 285/35/18's
https://my350z.com/forum/media-share/235228-updated-pics-with-new-camera.html

+1 on the Tanabe. You are only going to get 1-1.50" with them.

Thanks for the advice.... is there any drop that is almost 2" or so? I want it slammed, but idk if Ican do that with out coilovers.

Go 40 series all around if you put Tanabe GF210, don't put 35 series on the rear, you'll still have big gap between the fender and the tire.