The BMW M4 is already a great looking car, but the Eibach Pro kit coupled with some Spacers just gives it a little more edge.
Spec:
Eibach Pro Kit 20mm Front 10-15mm Rear
ST Suspensions Spacer Package
Dropping the ride height by 15-20mm and filling those wide arches really gives the M4 a meaner, wider stance. Lowering the car also comes with handling advantages, the lower centre of gravity makes the car feel more stable when cornering and further reduces body roll. Ride comfort on the Eibach Pro Kit is very similar to stock so if you decide to fit the Pro Kit to your M4 you wont be sacrificing any comfort or quality.