Had the bilstein adjustable shocks installed yesterday, using my existing stock springs. Very happy with the result! Ride is alot firmer but not stiff and bumpy at the same time, which is exactly what i wanted.
I got 18"s put on at the same time and had to lower the car my 2 circlips on the shocks and i think the result is perfect. Needed spacers aswell.
Just a note, when we compared the bilstein shocks to the stock ones, the circlip groove sydney kid mentioned is the same ride height as the stock springs does not measure up when you put them side by side... or maybe i got confused and thats bilsteins recommended height, not the stock height of skylines. In anycase, 2nd bottom circlip groove for 18" rims is perfect for me!