Steeda S550 Mustang Dual Rate Ultimate Handling Lowering Springs (2015-2019+)

Steeda S550 Mustang Dual Rate Ultimate Handling Lowering Springs (2015-2019+)
Steeda S550 Mustang Competition Dual Rate Springs 2015-2017
$119.99 (30%)

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Suggested Mods


Product Installation Instructions

Are you looking for competition-proven handling performance for your 2015-2019 S550 Mustang while still maintaining street drivability? Steeda's Dual Rate Ultimate Handling Springs are your answer! 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 S550 Mustang .750" all around, these springs provide an optimized center of gravity and an aggressive stance. Pair these with our Pro-Action shocks and struts as well as other Steeda suspension products to make your S550 Mustang a winner!

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 

Note: Steeda Springs are manufactured under these rigorous manufacturing certifications: QS-9000 & ISO 9001.

Product Benefits:

  • Lowers the vehicle .750" at all 4 corners
  • 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
  • LIFETIME warranty

California Residents: Proposition 65 Warning

Fitment & Features


Manufacturer: Steeda Autosports

Installation Information:

Level of Difficulty: Tech Recommended
Install Time: About 4 Hours
Tools Required: Basic Shop Tools

Vehicle Fitment:

Fits Model Year: 2015, 2016, 2017

Customer Reviews

Best Performance Suspension Mod Ever!
I upgraded my springset to the dual rates not too long ago (my 3rd set) and took my car to the track and I was amazed at the difference! My best time of the day was a full 5 seconds faster at Thunder Hill's West 2 Mile configuration. That was on a MPSS tire set and since then I have added a set of RE-71R's and dropped another 5 seconds! If your serious about performance, then this is your set! Full disclosure though, I have all STEEDA suspension components like adjustable dampeners, camber plates, rear shock mounts, IRS alignment kit, IRS braces, front "Extreme-G" K-brace and IRS Bushing support kit.
Did you find this helpful?  2 of 2 Found Helpful
Reviewed by:  from Bay Area, CA. on 9/30/2018
Very Nice!
On my 2018 GT, the stock springs/shocks are much better than my 15 GT due to Ford changing to monotube shocks and springs and i was hesitant to change but risked it anyway. Very glad I did, With these springs and Steeda's non-adjustable struts/shocks, it feels much more compliant on the crappy gravel, pot hole neighborhood roads here in N. Fl. but hit the back winding roads and it feels glued without being harsh. The rears where a bit stiff at first until I was able to exercise them with some repeated 60 mph emergency lane change maneuvers and some aggressive on-exit corner acceleration. They then came to life and really allow the perfect amount of weight transfer to throttle out of the corner without the rear getting snappy. No caster/camber plates needed if you like slightly more camber barely within factory specs. Mine came in at -1.80 camber, which I like. I suggest letting the springs break in a couple of hundred miles before getting an alignment. My car settled another .25 inches. I did all the work in one afternoon and love the quality of the parts. The only surprise is they are much heavier in weight than the stock springs. I would guess-timate almost twice the weight. I've been using Steeda parts and tunes since they started and will always look to them first for my mods. Thanks everyone at Steeda!
Did you find this helpful?  2 of 2 Found Helpful
Reviewed by:  from Panama City, Fl.. on 9/4/2018
Unrivaled Spring Package with Upgraded Dampers
I highly, highly doubt there is a superior "non-coilover" spring package out there. The rates make total sense. The fact that they're dual rate has significantly reduced body roll on my car such that I can run softer sway bar settings for increased compliance. Additionally, with Pro-Action Adjustable dampers, these are more than tolerable on the street, even with my upgraded bushings and bearings, bracing, and lower profile tires. I am often approached by people I passed on track asking "what coilovers do you have". You'll have to spend big bucks to beat these things.
Did you find this helpful?  8 of 9 Found Helpful
Reviewed by:  from . on 4/13/2018
Competition dual rate springs - daily driver review
Installed these springs myself, using the supplied instructions. First impression was, they feel like stock. Then I hit the highway and damn these make the car feel tight, planted and secure, cornering is way more flat. Highly recommend these springs. Alignment was easy to dial in, as the drop was 0.75-0.9 inch all around. Car doesn't bottom out on any speed bumps. IMHO perfect height.
Did you find this helpful?  12 of 12 Found Helpful
Reviewed by:  from Vancouver, B.C.. on 12/9/2017
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