Ford Racing lowering springs for 2015–2019 Mustang (without MagneRide) lower the car about 1.0 inch to give a more aggressive stance while improving handling dynamics. Produced by an OEM spring supplier, these springs are intended to work with production struts, shocks and sway bars and include M‑5570‑B jounce bumpers. Expect tightened handling with ride quality retained, though springs may be slightly firmer than stock.
Ford Racing 15-19 Mustang (w/o MagneRide) Street Lowering Spring Kit