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SR Performance Lowering Springs (15-20 GT, EcoBoost, V6 w/o MagneRide)

Item 387284
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$179.99 (kit)

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      Review & Installation Video

      Hey, everybody. I'm Justin with, and in this video I'm going to be breaking down the new SR Performance Lowering Springs available for your 2015 Mustang.The SR Performance Springs are the latest performance spring offerings for your S550, and in true SR Performance fashion, the price point's coming in a little lower than some of the other offerings available here at AM. That's because the goal of SR Performance is to offer performance and suspension components that will perform as intended, but without breaking the bank. Now, if the S197 SR Performance Lowering Springs are any indication on how these are going to perform, then all 2015 owners definitely want to give these a strong look. The '05 to '14 SR Springs are by far one of the most popular items here at, and the same qualities that made those so great are carried over to the new springs here for 2015. So, with all of that said, let's get into some of the big points here with these new SR Springs for 2015.Now, you can expect your S550 GT V6 or Ecoboost to be dropped approximately one inch on all four corners using these springs, which, in my opinion, seems to be the magic number here with the new chassis. It's definitely enough to get rid of that ugly wheel gap, of course, but at the same time, it's going to be very daily driver-friendly, meaning you're not going to scrape over every speed bump or pulling into every driveway. If you guys are regular viewers to the channel or to our site, of course, then you know besides looking cool, that lower center of gravity and lower ride height is also going to help you and your 2015 Mustang handle much better, of course. The 2015s, with their new independent rear suspension handle great right out of the box, but it's been my experience that these cars with a set of after-market lowering springs just feel much more playing it to the road.Going over some tech specs quickly with the SR springs...they are a progressive spring, meaning they're going to offer a nice comfortable ride under normal driving conditions, but then will firm up, of course, as they are pushed harder in turns. In addition to that, they will fit both your coupe and convertible S550, in addition to, again, all GTs, V6 and EcoBoost Mustangs.When it does come time to installing your brand new SR Performance Lowering Springs, well, it's a little bit more involved thanks to the new IRS, but really not that bad, overall. If you are attempting this install for the first time, you might want to leave yourself about a half a day in the garage to get everything knocked out. Most importantly here, make sure you have a decent set of tools on hand, and of course, that spring compressor as it will be needed here with this install. As always, guys, I like to recommend, give us a shout here at, get a Mustang expert on the phone, if you have any more questions about the install or about the SR Springs themselves.So if you're looking to drop your new Mustang, improving not only your looks but also your handling performance, while at the same time not breaking the bank, then be sure to check out the new SR Performance Lowering Springs for your S550, available right here at

      Product Information

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


      • Lowering Springs
      • Lowered Muscle Car Stance
      • Lowers Center of Gravity for Improved Handling
      • Progressive Spring Rate
      • Blue Powdercoated Finish
      • Estimated Drop: Front - 1.0”, Rear - 1.0”
      • Clears Stock and Aftermarket Wheels & Tires
      • Not Compatible on MagneRide Equipped Vehicles
      • Fits 2015-2020 GT, V6 and EcoBoost Mustang Models


      Performance Handling. Installing a set of SR Performance Progressive Rate Springs will lower your S550 Mustang's center of gravity, which will reduce squat during acceleration, body roll in the corners, and excessive nose-dive under hard braking. SR Performance Springs are ideal for daily driving, street, and even occasional track use.

      Muscle Car Stance. Not only does a set of SR Performance Springs improve the handling performance of your Mustang, but they also improve its overall appearance by lowering the ride height approximately 1.0-inch eliminating that huge tire to fender gap, for a more aggressive street stance.

      Progressive Design. Progressive springs (also known as variable rate springs) are designed to be more compliant when riding over rough and uneven surfaces like public roads. Progressive springs are engineered with a low starting spring rate that increases as the spring compresses. Variable rate compression allows for a smoother ride, while still providing good handling characteristics when pushed hard. This makes progressive rate springs a popular choice for daily street driven Mustangs.

      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.

      Professional Installation Recommended. Seeing that a spring compressor is required for installation of these Coil Springs, AmericanMuscle recommends professional installation. With the proper tools, installation can be completed in about three hours. Please note that an alignment is highly recommended after installation.

      Application. This set of four SR Performance Lowering Springs are specifically designed for use on 2015-2020 coupe and convertible Mustangs equipped with independent rear suspension (IRS), including the V6, EcoBoost and GT models. Does not fit Shelby GT350 models.

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

      SR Performance

      Fitment: 2015 2016 2017 2018 2019 2020 Details

      MPN# 387284

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.7 out of 5 overall rating from 100+ customers

      Installation Time: Full Day

      Installation Cost: $250-$500

      • December 26, 2019

        5 2015 GT - Hazin

        Perfect drop

        I run on 275/35/20 front and 295/35/20 rear. Dropped the car down by an inch and looks absolutely amazing. Ride is more softer and handles better

        Helpful (0)
      • October 13, 2019

        5 2018 GT - Cogency Installation Time: Shop Install Installation Cost: $250-$500

        Perfect stance, much improved ride

        I was just looking to improve the stance and handling of my ‘18 GT. These springs are perfect. Still clears steep driveways and speed bumps, while vastly improving the the look and handling. Paired these with 25 MM spacers and the handling dynamics have been transformed. Cannot recommend enough especially for the price.

        Helpful (0)
      • October 03, 2019

        5 2019 EcoBoost - AMA Installation Time: Afternoon

        Perfect fit

        Exactly the inch drop I need to reduce wheel gap.Smooth ride like oem

        Helpful (1)
      • September 24, 2019

        5 2016 V6 - RyanH Installation Time: Afternoon

        absolutely the best bang for your buck

        purchased these lowering springs for my 2016 mustang and man the stance is amazing but definitely would recommend a shop do it unless you have the right spring compressors. took me about 6 hours to install at a midas since i work there i could use the lift which was extremely helpful all in all if you are considering a budget friendly lowering spring with good quality buy these springs

        Helpful (0)
      • August 22, 2019

        5 2015 EcoBoost - Richardm682 Installation Time: Afternoon


        1 inch drop. No more wheel gap. No difference in ride quality

        Helpful (1)
      • August 10, 2019

        5 2015 GT - Colton Installation Time: Afternoon


        These were perfect for eliminating some wheel gap but it didn’t lower enough to worry about scraping. I could be more satisfied!

        Helpful (1)
      • July 30, 2019

        4 2019 GT - RS550GT Installation Time: Afternoon

        Lowering springs

        Pretty basic install. Car handles a lot better and the height sits just perfect for no scrapes or having to be worried about speed bumps and driveways. Ride is a little firmer then stock but still good for daily driver. My only complaint and the only reason I did not give 5stars is springs are not labelled for direction of install (wasted time figuring out which side was up).

        Helpful (0)
      • July 11, 2019

        5 2018 GT - Carlos Installation Time: Shop Install Installation Cost: $100-$250

        1 inch drop

        1 inch drop all around, great ride quality and like the way it looks

        Helpful (0)
      • June 24, 2019

        5 2018 GT - MannyB

        looks great

        install didn't take too long, ride quality feels good.

        Helpful (0)
      • June 18, 2019

        5 2017 GT - JasperB Installation Time: Full Day

        Great Springs

        Ride height is Perfect also going over bumps is not a lot of bounce plus its smooth. Check my car out at "Jay F8st" on YouTube.

        Helpful (0)

      Questions & Answers (66 answers)

      5 Top Rated Questions

      I installed these by my mechanic, after a few weeks the rear started to make creaking sounds when moving at slow speeds over any kind of angle or bump. Did they not do something correct or is this normal?

      • No, The creaking sounds are not normal for this product. The SR Performance Lowering Springs will not provide any noises which will be different from the factory springs.

      Helpful (24)

      So I have 20inch rims ,my tires are 255/35/20 and 285/30/20. If I combined these springs with 1 inch spacers, will it rub?

      • You should be able to install the SR Performance Lowering Springs with those size tires without any rubbing issues.

      Helpful (8)

      I will be putting this together with the 19' gt 350 wheels and will be running the recommended tires on a v6, will I need some camber plates as well for alignment or will I be fine?

      • It is recommended to either get caster camber plates or just camber adjustment bolts to get a correct alignment after the vehicle is lowered.

      Helpful (7)

      Will i need camber kit to get perfect alignment if I install these springs

      • These SR Performance Lowering Springs will likely not require any additional components because it will only lower the vehicle one inch in the front and rear. If you would like the additional adjustability, we would highly recommend the BMR Camber Adjustment Bolts, item 391005 or the Steeda Front Adjustable Camber Bolts, item 398192.

      Helpful (5)

      Hey AM, I have nitto invos 255/35ZR20 97Y in the front, and 275/35ZR20 102W in the back. will those springs fit well and wont cause any tear?

      • The SR Performance Lowering Springs will clear those tires without any issues yes!

      Helpful (2)
      10 More Questions
      I have a 2015 gt convertible premium, would it be ok to install just the front springs and drive it that way for a while, and then put the rear springs on later? 1 answer
      I just ordered these springs and can't wait to put them on my 2015 GT, but will my tires rub? I have 20" staggered Shelby rims with 305 Micky Thompsom tires on the rear. 1 answer
      For GT PP cars, how does ride/handling compare to the current springs on the car? Will these be stiffer or about the same? 1 answer
      I have 20x10 (niche surge) wheels on 305/30/20 tires, will it rub? 1 answer
      What is the spring rate of these springs? 1 answer
      I have 20x10.5 rims and 285 tires in the rear with 20x9 and 255 in the front. If I combined these springs with the 1 inch spacers, will I rub? 1 answer
      Do you need a alienment 1 answer
      Hi, do you have the K value of these springs? 1 answer
      Don't know why my 19 Mustang GT was only minimally lowered by these springs; not close to 1". Is it possible they were incorrectly installed or will they only go one way? Could the front have been installed in the rear and rear in the front? They were installed by a friend. Could a mistake have been made that prevents achieving the 1" drop? Thanks in advance for any assistance you may provide. 0 answer
      Right after installing these springs, I noticed a knocking sound coming from the front right every time I go over a speed bump and/or a small bump in the road. I jacked the car back up and nothing seems to be out of place. Do you know what could be causing this? Could the spring be defective? Please let me know if you guys know how to fix this issue. Thank You! 0 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (4) Lowering Springs

      Tech Specs

      Springs Specifications
      Spring Rate:Front: 185-275 lb/in.
      Rear: 800-880 lb/in.
      Progressive or Standard:ProgressiveEstimated Drop:

      1.0"F / 1.0" R

      Will It Fit My Mustang

      • Bullitt - 19, 20
      • EcoBoost - 15, 16, 17, 18, 19, 20
      • GT - 15, 16, 17, 18, 19, 20
      • V6 - 15, 16, 17

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