Snap, Just done the same on my Skyline, But mine are green :)
Had those. I felt every crack in the pavement, every patched pothole and every piece of debris I drove over. On the positive side, handling was great, like the car was glued to the road.
Are the shocks not adjustable on those? My coilovers felt like that, and a couple clicks to the soft side and it was a world of difference.
Out of curiosity, how long did it take you to install? I was thinking about doing the same, but I’ve never done suspension work. My handiness level is about a 7/10, the process looks straight forward enough though.
Entirely depends how old your car is. If new, or less than 10 years old it will take around 2 hours if you have all the tools. For me it took 4 days because my car is around 25 years and all the bolts were rust welded. Had to heat the bolts, impact them, restore the parts etc.