He's talking about the Tein Street Basis Coilovers, Zspeed is listing the set for $625. Based on his history, Op most likely will buy it and resell them on the forum for 2x the cost, like his Greddy turbo kit
ZSpeed Performance Nissan Infinti OEM & Performance Parts
Range
Front +.9/-1.9"
Rear +1/2/ -1.3"
9KG Front Springs
8KG Rear Springs