i want to get the whole koni yellow set up but im not there yet, so can I just change the rear shocks? don't have the $ to do the front and the new caster camber plates that are required.
would it make the ride quality horrible having good shocks in rear and stock up front?
should I just wait and do it all at once?
You can put them on now with no worries.
Set them somewhere between full soft and one quarter of a turn up from full soft.
When I got the yellows for my '08, Koni had just started to re-engineer the endlink brackets on the struts (IIRC, there was a weld failure problem at the time). Took nearly a whole year for the new design struts to filter down through the pipeline, and in that time there was never any issue with running OE struts paired with Koni shocks.
'08 GT coupe, 5M, wheels, tires, pads, fluid, a few suspension mods . . . still almost stock height
'19 WRX, 6M (the "family sedan")
'01 Maxima 20AE, 5M (the spare and occasional winter driver)