Just wondering if anyone has ever used these on your Z

They have two versions type I and type II

http://www.f2autolife.com/storefront....php?info_id=5

http://cgi.ebay.com/ebaymotors/FUNCT...QQcmdZViewItem

On website says you can request different spring rates, sounds cool. Just quickly lookin at the info they are 20mm smaller spring than the stance
180mm < 200mm

 

Be cautious of any maker that claims to allow you to pick different spring rates. If you pick a rate that is beyond 2Kg above or below the standard off the shelf setup and they are not valving them differently to suit your choice, make another choice.

Also be mindfull that inexpensive coilover products tend to be underdampned, may not the type of ownership experience your looking for.