Re: Springs VS Coilovers
I took over a set of H&R springs for my ex-car and it was lowered really aggressively. See photo:
However, I felt that the shocks were unable to match the springs properly and I did have some bottoming out when I took corners faster and the corners had sudden dips. They unsettled the car easier and they were scary moments... And u can only estimate how much the springs are going to lower the car once you put them on. There is no trial & error like coilovers where u can adjust both height and/or damping (ie. PSS9 or KW var.2).
There are 3 common kinds that you can look at:
1. Springs (just springs)
2. Spring & Shock Suspension kits (H&R cupkits, Koni kits, etc) - where u get matching shocks to the shorter springs
3. Coilovers - Height-adjustable, Height & bound adjustables and Height, bound & rebound adjustables.
In the end, I swapped out the springs after 2wks and went with KW Var.1 kit (height adjustable only). Never regretted my decision after that. New car waiting for my KW var.2 (height & bound adjustable).
Hope I explained a bit. More technical pple can chime in!
Happy decision-making!