If your looking to lower your car I would highly reccomend the CETE lowering module:
https://tagmotorsports.com/cete-ble-...owering-module
It's a little pricey but it's been an absolute dream! You can lower your car down to -55mm and raise it to +30mm. I used to have lowering springs on my G30 5 series and now it seems like such a cave man thing to have your car lowered ALL THE D*MN TIME. With the module you can even save the lowered height for different modes. Like sport mode can have a lower ride height than comfort. There is also show mode where you can lower you car to -60mm.