Description from our website:

Are you looking for competition-proven handling performance for your 2015+ S550/S650 Ford Mustang while still maintaining street drivability? Our Steeda Dual Rate Ultimate Handling Springs are now available for your MagneRide equipped Mustang! Our experience and expertise in high-performance street and racing suspension systems is second to none, and the team here at Steeda has put that experience to work for you. Designed for ALL street and road racing applications, Steeda's Competition springs have the highest rates on the market but still maintain a comfortable and enjoyable ride when put on the street.

Competition-proven in both NASA and SCCA events, these springs greatly reduce nosedive and keep body roll to a minimum for the ultimate in performance handling. By lowering your Mustang .750" all around, these springs provide an optimized center of gravity and an aggressive stance. At a recent HDPE event, Steeda clocked a 4 second lap time improvement with the just our springs and adjustable camber plates. They are a tremendous handling upgrade for GT350's as well as any MagneRide equipped Mustang.

Professional racecar driver, Billy Johnson borrowed a Q500 for some laps at Palm Beach International Raceway and this is what he has to say about them.
"The Steeda Q500 was a blast to drive on track... The adjustable suspension was far from harsh and had a wide range of adjustability to dial the car in at the track. Overall it was a nice dual purpose street and track package that raised the limits of the Mustang GT." - Billy Johnson

Benefits:
Lowers the S550 Non PP Mustang .750" front & rear
Lowers S550 GT350, PP1, & PP2 Mustangs .500" front & rear
Lowers S650 1.3" front & 0.75" rear
Designed for competition racing but maintains outstanding street-able ride
Highest spring rate for dramatic improvement in handling and reduction of nosedive
Steeda collaborates with the best motorsport spring engineers in the industry to provide you the best products possible
Steeda springs are developed using advanced proprietary CAD data, and our exclusive 3D modeling setting us apart from the others
Race-proven in NASA and SCCA events

Or buy from Steeda.com