There are several brands, the two most popular are H&R and Eibach. All the tuners also hav...
There are several brands, the two most popular are H&R and Eibach. All the tuners also have springs like Kleemann, Lorinser, Renntech, etc...
I have Eibachs because they preserve the current ride comfort. The H&R's lower the car a little more and handle better but compromise the ride quality a little bit. They typically run about $250 U.S. for a set of 4 springs for either brand. Tuner springs cost a lot more.
If you want to lower it more than about an 4 cm then you'll want a cup kit or coilovers. This is because when you lower it more you'll need the shocks to go with it. Look to spend $700-1,500 for these kits and H&R is a popular brand, Eibach doesn't make these for our car.