Time to upgrade the suspension ...

cv129

Well, RS1 is just JRZ's entry level product. They are great indeed, but I wouldn't put that on a pedestal so high as "the best".

Zeal (by Endless) isn't covered much here, IMHO it's probably the best Japanese coilovers (exclude the Euro x Japan collaboration units like Aragostas, or euro coilovers revalved for specific Japanese tunning shops). If OP can get a set of NEW Zeal Function X for $2k, then there isn't really anything to think about IMHO.

As far as V3 and Pss10's progressive rear springs, you can always just substitute with a pair of linear units from Hyperco or Swift, you just have to get the right adapter, rate, inner diameter, and length. But extra costs will incur.

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Setrab | RE-71 | SPL | JRZ | Nismo | ARK | Whiteline | RacingBrake | CJM Oil Pan | Ti shield