You must reduced your vehicle for maximum 1.5 inches. This is the best height to have actually the aggressive lowered look and also still be comfortable to ride. If you go even reduced, the ride will not be stiff, you have a high hazard of bottoming out and scraping against any kind of driveways and rate bumps. 

By the method, bottoming out happens as soon as the bottom of your car hits the road. In situation you didn’t recognize