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

Item 387284
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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

      • March 11, 2020

        5 2015 EcoBoost - Frankenvonstein Installation Time: Shop Install Installation Cost: $500-$1000


        These SR performance springs are phenomenal, even better when paired with RTR suspension components. My car plants firmly, is at least an inch lower and still maintains a ride quality that doesn’t bust your back or jar your teeth out. Get some!

        Helpful (0)
      • February 20, 2020

        5 2017 GT - JenH Installation Time: Afternoon

        Looks and feels great

        Best Buy. The SR performance springs are amazing, perfect drop and handles great.

        Helpful (0)
      • February 17, 2020

        5 2019 EcoBoost - RossJ Installation Time: Less than 1 Hour

        Got the part i needed

        Great product highly recommended!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

        Helpful (0)
      • February 11, 2020

        5 2016 GT - DerekR Installation Time: Full Day


        I installed these in my garage using a floor jack and 2 jack stands. I took my time because it was the 1st time swapping springs. I took the front coilovers to a friends garage to compress springs, once they were swapped everything was simple. The rear was easy too. Take your time if its the first time doing this. Well worth the results. Along the BMR 4point chassis brace, Steeda jacking rails, my 2016 Convertible is handling 1000 times better.

        Helpful (0)
      • January 29, 2020

        5 2015 V6 - JKil64 Installation Time: Full Day

        Great Springs

        Just as described. Great customer service. Product matched the description and dropped it the perfect amount

        Helpful (0)
      • January 28, 2020

        5 2017 GT - Hunter1776 Installation Time: Afternoon

        Definitely worth it

        I was a little worried before I bought these because they were cheap, but they turned out to be great.! Lowered the car evenly in the front and back and eliminated the ridiculous wheel gap. Only problem I had afterwards was a loud creaking sound going over speed bumps and dips in the road, but this was EASILY fixed with BMR adjustable front sway bar end links. Just make sure to tighten them with the weight on the suspension, not while in the air.

        Helpful (1)
      • January 22, 2020

        4 2016 GT - Z1 Installation Time: Afternoon

        Mustang 2017

        It's one of the best part I ever bought for my car drives excellent

        Helpful (0)
      • 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 (2)
      • 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)

      Questions & Answers (68 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 (26)

      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
      Would these springs work with my set up? I have 285s in the front and 305s in the rear. I have 19X10 wheels in the front and 19X11 in the rear. The front wheel has an offset of 35mm and the rear wheels have an offset of 50mm. I was wondering what I would need also if I went with these springs and if the springs would clear the tires! 1 answer
      What is the best size rims and tire in the front, and what size rims and tire in the back for this lowering springs 1 answer
      Hi, do you have the K value of these springs? 1 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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