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Steeda IRS Subframe Braces (15-19 Fastback)

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Market Price $268.95 You Save 11% ($29.00)
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$239.95

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  • Item 388840

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    Features, Video & Details

    • Improves Handling Performance
    • Eliminates Rear Sub Frame Movement
    • Reduces Wheel Hop
    • Tubular Chromoly Steel Construction
    • Silver Flake Powder Coat Finish
    • Direct Bolt-On Upgrade
    • Made in the USA
    • Fits All 2015-2019 Fastback Mustang Models

    Review & Installation Video

    Review & Install Video

    Hey, guys, Stephanie with americanmuscle.com here with a review of the STEEDA IRS Subframe Braces for 2015 and up Fastback Mustangs. We're gonna talk about a few different topics when it comes to these subframe braces but mostly we're gonna talk about the construction and the functionality of these braces and the install as well. I'll get into more detail later, but I can tell you right now that the install for these braces is easy. You're looking at a one out of three wrenches in the difficulty meter since these are a direct bolt-on item. The STEEDA IRS Subframe Braces are gonna be something that you should check out if you're looking to minimize some of that rear subframe movement and combat some of the wheel-hop that's notorious with the S550s. We all love getting power to the ground and that's kind of hard to do with so much rear subframe movement and wheel-hop, but these braces are designed to eliminate the deflection in the rear subframe that the stock bushings allow for. So just looking at these on the table here, these have a three-point triangular design, with the general idea behind these being stabilization through tying together three chassis points, the lower control arm and tow link mount area, the rear subframe and the frame rail. Now these are three areas that are very strong naturally, so tying them together gives a good base of support for the rear subframe. And keep in mind that the rear subframe is really only four bolts, so that leaves a lot of room for improvement. The other thing that I wanted to point out here is that these braces are going to utilize existing holes. This leads to two good things, one is that you won't have to do any type of modification to get these installed, and they're direct bolt-on upgrade. And two is that since you aren't modifying anything, you're just adding support, you're not going to be adding any NVH to the ride quality of the car. Now these are tubular Chromoly steel, and they're also powder-coated silver, which you're not really going to see unless you're under the car, but the powder-coat does give some corrosion resistance. Keep in mind that while these braces are going to work to reduce wheel hop and keep the rear planted better under load, these are only one component of the IRS and there are a handful of other pieces and options that you can look into depending on what you want to do with your Mustang. What I like about these is that they aren't going to create any additional noise or harshness in the suspension. I'd say that these are a good foundation-building mod in the sense that they help you set your Mustang up for the performance that you expect out of it. As far as price, these braces are right in between $200 and $300, and right now these are the only one of their kind that are available. You don't have another brand that's offering the same type of product so there's nothing to compare it to price-wise, but I will say that this does happen to be one of the less expensive options out there when you look at other options on how to reduce wheel hop. When it comes to the install here, it's really pretty easy. Overall, this is a one-wrench install on our scale and should take about just an hour to complete. The braces are side-specific and can only go one way, but we're basically looking at a few nuts and bolts. You need a few sockets, a ten millimeter Allen key and a torque wrench for sure since all of the bolts will need to be torqued down. Wrapping things up, the STEEDA IRS Subframe Braces are gonna tie in three points of the chassis to help stop rear subframe movement and help put some power to the ground and avoid some wheel hop. They're tubular Chromoly steel and easy to install too. As always, you can check them out more online and see what you think for yourself. And for all things Mustang, keep it right here at americanmuscle.com.

    Eliminate IRS Subframe Movement. The Independent Rear Suspension (IRS) of the S550 Mustang is notorious for moving under acceleration, hard braking and even spirited driving, but by installing a set of Steeda IRS Subframe Braces you can eliminate rear sub frame movement and reduce dreaded wheel hop to improve overall handling performance.

    Tubular Construction. Steeda designs and manufactures their IRS Subframe Braces in the USA from tubular 4130 chromoly steel in a 3-point triangular design for superior strength and features a durable powdercoated silver metal flake finish for corrosion resistance.

    Easy Bolt-on Installation. Steeda's IRS Subframe Braces are designed to be a simple bolt-on upgrade that  utilizes the existing stock mounting points with no welding, cutting or extra modifications required for a straight forward bolt-on install.

    Application. These Steeda IRS Subframe Braces are specifically designed for use on 2015-2019 Fastback Mustangs, including the V6, EcoBoost and GT models. Does not fit convertible models.

    Note: Coupon codes cannot be applied to this product.

    Fitment: 2015 2016 2017 2018 2019 Details

    MPN# 555-5754

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    What's in the Box
    • (1) Driver side IRS subframe support brace
    • (1) Passenger side IRS subframe support brace
    • Installation hardware
    Installation Info
    Tech Specs
    Will it fit my Mustang?
    • Bullitt - 19
    • EcoBoost - 15, 16, 17, 18, 19
    • GT - 15, 16, 17, 18, 19
    • GT350 - 15, 16, 17, 18, 19
    • GT350R - 15, 16, 17, 18, 19
    • V6 - 15, 16, 17

    Does not fit convertible models.

      Customer Photos (28) Submit Your Photo

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        Questions & Answers (20)

        5 Top Rated Questions

        Will these fit with the BMR cradle lockout? And if not, which one is the better option?

        • The Steeda IRS Subframe Braces will work with the BMR Cradle lockout kit.

        Helpful (8)

        Do these go over or under the Steeda Ultralite jacking rails?

        • The Steeda IRS Subframe Braces don't use the same mounting points as the Steeda Ultralite jacking rails. They do not interfere with each other so you could install them any order you like.

        Helpful (4)

        Will these work with the Bmr lockouts?

        • No. I am having to return my lockout kit right now.

        Helpful (3) Show 1 more answer

        Will this work with the BMR IRS Cradle Bushing Lockout? I pretty sure it doesn't but im wondering.

        • These are not compatible with the BMR IRS Cradle Bushing Lockout kit.

        Helpful (2)

        What would be the difference between attaching these braces vs. SR Performance IRS Tie Down Kit?

        • The Steeda IRS Subframe Braces are designed to brace the rear subframe and prevent the subframe from flexing in relation to the unibody. The SR Performance IRS Tie Down Kit is designed to prevent flex at the bushings for the IRS mounting. While both will work toward a similar goal of reducing wheel hop, they do so very differently. The braces will provide the largest reduction in wheel hop.

        Helpful (1)
        Post Your Question
        10 More Questions
        I have the Ford Performance X-pipe with the side exit exhaust that exits just in front of the rear wheels. Will this fit with that exhaust installed? 1 answer
        I just received a set of BMR low profile jacking rails in red. Can I install the jacking rails before installing the Steeda IRS Subframe Braces and will they interfere with each other? 0 answer
        Is this compatible with the SR Performance IRS tie down kit? 0 answer
        I drive a 2017 gt convertible. During an exhaust install, I removed the factory reinforcing brace that goes from underneath both doors to the rear of the car. With that removed, will these fit in place? The factory part will not go back because of the exhaust. 0 answer
        Can these be used in conjunction with the BMR low profile jacking rails? As usual, thanks for your assistance, 1 answer
        how is this item compared to BMR IRS Subframe Support Brace System? 1 answer
        I have convertible and these are for fastbacks,is there another for convertibles? 1 answer
        Will these help keep my car from being all over the road and under control 1 answer
        Would these go well with the ford performance track suspension kit? 1 answer
        Can I combine this procuct with the steeda vertical links for even more control and wheel hop reduction? 1 answer

          Customer Reviews (100+) Write a Review

          Overall Rating 4.7

          out of 5 stars

          Installation Time:Less than 1 Hour

          Installation Cost:$100-$250

          • Handling Improvement 4.570248 4.6
          • Fit 4.743802 4.7
          • Bang For Your Buck 4.628099 4.6



          • 5/5

            Installation Time: Afternoon

            April 25, 2019

            Speeda subframe braces

            Easy to put on,it took me 1hr 45mins by myself. I recommend this to anyone with a Mustang.

            FerinandP

            Year: 2018 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            April 25, 2019

            Steeda IRS subframe braces

            Real nice product very easy to install everything lined up great very nice item.

            burg

            Year: 2018 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            April 22, 2019

            Exactly as advertised!

            Did exactly what it said it would do! Car rides clean and smooth now with little to no wheel hop coupled with my new tires!

            s20055

            Year: 2015 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            April 17, 2019

            Definitely big difference

            Very happy with product! Good quality and always on time! Steeda definitely makes a nice product!!!

            Greek1

            Year: 2015 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            April 13, 2019

            Race Ready!

            These braces were very easy to install. I ran the GT up on 6 in. ramps and installed both braces by myself. I can not get over how good the fit was! I will find out how the braces work with sticky tires on the Formula One track. There should definitely be an improvement coming out of the corners. Street wise the cornering is better.

            AL75

            Year: 2015 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            April 08, 2019

            Easy install, needed to be painted

            This was an easy install. It was part of my "Stop the hop" solution. Unsure how much this contributed, but I have no axle hop problems. Mine came in grey, but begged to be painted red, so now they are (I know I'm the only one who will ever know they're red.)

            JohnH

            Year: 2015 Submodel: GT

            Helpful (0)

          • 4/5

            Installation Time: Afternoon

            March 31, 2019

            Does what its supposed too

            Passenger side was difficult to line up and I dont mean the sub frame bolt bracket. Prob took hour and a half. It just seems that piece wasn't lining up and was off a bit. Drivers side went on no problem. I went to Lowes and got bigger washers because I didnt like the size of the ones that came with it. Feels tighter and more stable.

            JasonH

            Year: 2019 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            March 10, 2019

            Tightened up the rear end

            Eliminated wheel hop vibtration under hard acceleration. Very nice looking and well made. About 15 min per side to install.

            MattB

            Year: 2017 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            March 08, 2019

            Great subframe brace

            Super easy and fun to install. Slips right in. The difference is very much nitacible. Great improvement for a few bucks

            BasE

            Year: 2015 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            February 27, 2019

            Much stiffer

            From what I read these are a must to help stop wheel hop for the money there worth a try

            LarryS

            Year: 2017 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Less than 1 Hour

            February 22, 2019

            Certainly can feel a difference!

            These definitely help tighten up the IRS. It helps with the wheel hop fore sure. It doesn’t get rid of all of it but these are worth the price.

            StephenD

            Year: 2017 Submodel: GT

            Helpful (1)

          • 5/5

            Installation Time: Afternoon

            January 30, 2019

            Steeda Subframe Brace

            Well made product. Excellent idea to strengthen the subframe connection to the body. Surprising that this is the only one available and has not been copied.

            RoushSport

            Year: 2009 Submodel: GT

            Helpful (1)

          • 5/5

            Installation Time: Afternoon

            January 21, 2019

            Subframe brace on 2019 PP1

            Great affordable product. Helped stiffen up rearend. This along with Steeda vertical links helps keep the rear planted and cuts wheel spin down. I found the Roush instructions to be poor for such a big company. Do yourself a favor and watch a few videos on YouTube for a more straightforward install.

            GaryT

            Year: 2019 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Less than 1 Hour

            January 09, 2019

            worth the money

            Vehicle feels much more stable in the rear around corners and launches. Highly recommended even for casual driving. Great upgrade if you’re not looking to break the bank. Will also be upgrading the upper control arms and vertical links in the near future.

            TerranceM

            Year: 2015 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Less than 1 Hour

            January 04, 2019

            AWESOME!!

            Car stays straight as an arrow during a hard pull!!!

            ChristopherV

            Year: 2018 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Less than 1 Hour

            January 04, 2019

            Great on the track

            Perfect compliment for the performance pack and/or someone who is looking to push the car hard on the track.

            RichardC

            Year: 2015 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Less than 1 Hour

            December 30, 2018

            Awesome

            Very easy to install. Before install I felt a flexing of rear during accel and decel. It is completely gone now. Feels a bit tighter during cornering too. The brace tucks in nicely under car, so no loss of clearance.

            GregB

            Year: 2019 Submodel: GT

            Helpful (3)

          • 3/5

            Installation Time: Afternoon

            December 10, 2018

            Easy for a novice but....

            Easy installation, definitely recommend installing the Steeda Jacking Rails first though. The rear end feels much tighter and sturdy. Alignment was good as far as matching the holes on the 2017 Mustang GT. My only complaint is the lone center mount had a 5mm gap between the IRS asembly and the Mustang body. So I just kept tightening it until it got close but used the extra washers that came with the kit to close the gap...Therefore the 3star review. They need to close that gap or provide proper spacers. Hope this helps beginners like me.

            MichaelG

            Year: 2017 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Less than 1 Hour

            December 07, 2018

            Steeda Subframe Connectors

            The shipping process was fairly quick and the install took about 30-40 minutes. Helps that I have access to a lift and it makes it much easier and quicker to install.

            Brandon

            Year: 2018 Submodel: GT

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            November 26, 2018

            Subframe Braces on my '19 GT

            The rear definitely feels more stable/stiffer and improves handling imho. I would recommend these to others. I had my car on jack stands to install. Install was straight fwd however the rear bolt which you have to use a nut on was a bit of a pain to tighten due to the tight space. Use a wrench and not a ratchet to hold the nut ( trust me or else your ratchet will get stuck under the axle and boot, smh). Front 3 bolts to 45 ft lbs 2 rear bolts to 55ft lbs. Enjoy!

            HFLPUF2019GT

            Year: 2019 Submodel: GT

            Helpful (4)

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