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RTR Tactical Performance Lowering Springs (15-23 Mustang GT & EcoBoost Fastback w/o MagneRide)

Item 412205
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$298.99 (set of 4)

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      Video Review & Installation

      The RTR Lowering Springs are gonna be a good option for those of you out there that aren't looking for anything crazy from a lowering spring in terms of drop, and that want something for a daily driven car or a street car that's gonna create both a good look with a good set of wheels and an improvement in performance. I'll talk more about the install later, but you're looking at a two outta three wrenches in the difficulty meter. These springs don't give the same drop all the way around the car, but instead they give a precise drop that RTR feels is better in both categories. These springs offer a drop of 1.1 inches in the front of the car and 0.8 inches in the rear. Now, this is what I consider more in the standard side in the world of lowering springs for the S550 because currently you tend to see that the majority of springs offer a standard one-inch drop. But I'll go back to what I said earlier about RTR thinking that this drop is gonna give you the best of both worlds. The rear spring will drop the rear enough to make it look good, but not make it look too saggy, and give the car a better stance. Of course, a lowering spring is gonna lower the center of gravity to provide some handling improvements, like reducing squat and body roll in corners, and eliminating nosedive under hard braking. And like I just said, this specific drop is enough of a drop to give the car a more aggressive stance, especially when you have good fitting wheels and tires. With that said, keep in mind that the drop and the overall appearance will look a little bit different, depending on your wheel and tire setup. So these are gonna be compatible with both the factory and aftermarket wheel and tire setups. The plus side of the S550s looking so good and responding so well to a little bit of lowering is they can create a functional low. By that I mean it's low enough to look good, but not low enough to cause issues, either on the tire or under the car. It's gonna leave you with a very streetable car still. The other thing to consider when you're shopping for springs, besides the drop, is ride quality. These springs do have a progressive spring rate that RTR has tested on both the street and the track, so they give a nice street ride quality, but they're gonna firm up as you push the car during performance driving. As far as price, these springs are gonna cost between $200 and $300, which is right where the majority of other springs are falling, as well. Of course, there are some springs that are either less expensive or more expensive than that, and even springs that are all across that price range. So the install here is gonna take about four hours. I'm gonna call it a solid two outta three wrenches on the scale because you will need some knowledge to complete the install. So I'd recommend having a knowledgeable helping hand or taking this to a shop for the install if you haven't done this before, especially since it's always a good idea to get an alignment after the install anyways. The install can be done on jack stands if you don't have access to a lift, but as usual, a lift would be your best bet. Gonna need a few tools, including a spring compressor, so make sure you have that before you start the install. Gonna need to get down to the spring and strut assemblies, so everything like the wheels, brakes, and AVS lines will need to be moved out of the way, so you can pull the assemblies out of the car. The spring compressor will help you remove the spring from the strut and install the new front springs, which are compressed and installed the same way. New bump stops are slid onto the shock, followed by new boots. The strut assemblies go back the same way they came out and the install is the same for both sides. The rear is where things are a little bit different, but it's nothing crazy here. Essentially, the IRS subframe will be dropped, along with the rear shock mount, so you can slide the rear springs out. Just like the front, the rear springs install the same way they were uninstalled, no surprises here. The new springs can be installed and the IRS subframe can be bolted back up, and that's about all it's gonna take. Like I mentioned, a fresh alignment after the install isn't a bad idea. Wrapping things up here, the RTR Lowering Spring kit offers a 1.1 and a 0.8-inch drop in the front and rear respectively. These springs are designed to give you the best of both worlds between performance and looks. And as always, I suggest you check these out more online for yourself. And for all things Mustang, keep it right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Improves Handling Performance
      • Sleek Muscular Stance
      • Lowers Center of Gravity
      • Progressive Spring Rate
      • Gray Powder Coated Finish
      • Drop: Front - 1.1” Rear - 0.8”
      • Clears Stock and Aftermarket Wheels & Tires
      • Not Compatible on MagneRide Equipped Vehicles
      • Fits 2015-2023 GT and EcoBoost Fastback Mustangs


      Improves Handling Performance. Are you a S550 or EcoBoost Mustang owner that is looking for a great ride on the street and a significant increase in performance when putting your Pony through its paces? If so, you need to upgrade to a set of RTR Tactical Performance Lowering Springs. RTR Springs not only lower your Mustang, but they also feature proprietary street tested and track proven progressive spring rates for performance handling. These Springs were engineered to work with both base and performance pack dampers. However, in order to experience the maximum performance these Springs can offer, they should be installed along with RTR's matching Tactical Performance Adjustable Dampers and Sway Bars.

      Sleek Muscle Car Stance. Not only does a set of RTR Tactical Performance Lowering Springs improve the handling performance of your Mustang, but they also improve its overall appearance. By lowering the ride height 1.1" up front and 0.8" in the rear these RTR Performance Springs will eliminate that huge tire to fender gap, for a sleek muscle car stance without the rear sag that other kits have when they lower the front and rear the same amount.

      Clears Stock and Aftermarket Wheels & Tires. These lowering springs were engineered to be compatible with your factory size wheels and tires, as well as AmericanMuscle's pre-configured wheel and tire combo kits (specific to your generation), to assure proper clearance with no rubbing issues.

      Application. This set of four RTR Tactical Performance Lowering Springs were developed to create the perfect drop in regards to both appearance and performance and have been specifically designed for use on 2015-2023 Fastback GT and EcoBoost Mustangs.

      Technical Note. The Springs are not compatible on vehicles equipped with the MagneRide Suspension.




      RTR 1598-0412-02

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) Front Springs
      • (2) Rear Springs
      • (2) Front Dust Boots
      • (2) Front Bump Stops
      • (2) Rear Bump Stops

      Tech Specs

      Springs Specifications
      Spring Rate:Front: - lb/in.
      Rear: - lb/in.
      Year:2015-2021Model:GT Fastbacks
      Progressive or Standard:ProgressiveEstimated Drop:1.1" Front / 0.8" Rear

      Customer Reviews (89)

        Questions & Answers

        10 More Questions

        Will It Fit My Mustang

        • Bullitt - 19, 20
        • EcoBoost - 15, 16, 17, 18, 19, 20, 21, 22, 23
        • GT - 15, 16, 17, 18, 19, 20, 21, 22, 23
        • Mach 1 - 23