So I've been reading multiple reviews for these and it seems like there aren't too many things different from these, except for the fact that Flex Z aren't rebuildable according @
CSG Mike and the spring rates (6k spring rate on the Flex Z and 7k on the Street Flex). Tein website even says Flex Z are "more premium and better suited for streets" than Street Flex.
I'm using this car as a daily driver so comfort is the first priority, and the only modification so far is the 17x7.5 Enkei RPF1.
Street Flex is literally twice the MSRP (although a lot of retailers carry it for around $1100) of the Flex Z, but I can get it for only $130 more, and I honestly am clueless as to which one I should go for. If the difference is marginal and the Flex Z is better built, why is Street Flex still significantly more expensive?
I'm sure I'd be happy with either, but any input is greatly appreciated.