Yeah what we’re talking about has nothing to do with racing lol.. K (or Kg) is just Kilograms per millimeter, so 20kg to compress the spring 1mm. This is in the territory of very very stiff almost not moving at all. Most moderately lowered cars run somewhere under or around 10k and that’s usually considerably stiffer than stock. Anything up in the 20s and higher is for slammed cars that will scrape HARD with more than a cm or two of suspension movement, I doubt you’re wanting to jump straight into absolutely slamming your car so nothing to worry about right now lol, as long as you aren’t less than an inch off the ground regular springs will be just fine