Steeda Mustang Pro Active Shocks, Struts & Springs DIFM Assembled Kit (2015-2022)

2 Review(s)
Steeda's Do It For Me DIFM S550 Mustang Pro Active shocks, struts, and springs kit includes only compatible springs, dampers, and mounts to prevent mis-matched parts that don't fit or work well together.
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Part Number: 555 8423 DIFM

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Steeda's Do It For Me "DIFM" S550 Mustang Pro Active shocks, struts, and springs kit includes only compatible springs, dampers, and mounts to prevent mis-matched parts that don't fit or work well together. The spring selection in the drop down are the only Steeda springs we recommend using with the Active line of dampers. The Steeda Active line is our most comfortable damper offering touring car ride and sports car handling. For multi-driver households, the Active DIFM kit is a spouse approved upgrade.

Our new DIFM line of pre-assembled Mustang shocks, struts and springs save you the hassle of having to rent a dangerous spring compressor or going to a local shop with your old struts to install old used components onto your new struts. The DIFM arrives at your door as an all new and ready to install assembly. Your old strut assembly remains intact for possible future re-install or resale to another party. After installing on your Mustang, you will need to take your car to the nearest shop for alignment to avoid tire wear. All lowering springs require realignment after install due to suspension geometry changes.

With our convenient kit you do not have to to dis-assemble your old OE struts to reuse the bump stops, dust covers, coil spring isolator pads and bearing plate. The DIFM kit includes all new OE components in addition to Steeda upgraded components. Our bump stops are trimmed length specific micro-cellular poly foam for lowering springs and provide the softest cushion on hard impacts. Our bearing plate, dust boots, coil spring isolator pads, and other parts are genuine Ford OE parts. Of course the struts, shocks and springs are all Steeda premium quality upgraded parts.

Steeda recommended upgrades such as adjustable camber plates and stronger rear shock mounts are located in the options menu for owners wanting the absolute best handling and steering performance.

Purchase your Steeda S550 Mustang shocks, struts, and springs DIFM kit from Steeda Autosports today!

Features and Benefits:

  • Proprietary Active valving ideal for safest control on rough surfaces
  • Matched damper & spring combo
  • Steeda engineered and battle tested
  • Assembled by ASE Cert Ford technician
  • Safe install - no spring compressor needed
  • OE assembly left intact for re-use or resale
  • All premium Steeda and OE components

Note: Lowered amount may vary from car to car depending on vehicle package and trim options.

CA Residents: Cancer and Reproductive Harm WARNING

Fitment & Features


Manufacturer: Steeda Autosports

Installation Information:

Level of Difficulty: Easy
Install Time: About 2 Hours
Tools Required: Basic Shop Tools, Jack, Jack stands

Vehicle Fitment:

Fits Model Year: 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022

Customer Reviews

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Average Customer Ratings


It just gets better
Got this kit with the progressive lowering springs and camber plates plus bump stop bushings with the intent of doing it myself...well that lasted about 2 hours and a beer before I put the right front corner of the car back together and all the Steeda parts in the trunk and went to see my local mechanic...several hundred dollars later I got the car back and was plesantly surprised at the difference, it not only looked better, but it handles and rides better. I don't track the car, but I did want a compitent street machine and so far I think we got a winner. This mod along with all the other mods I have gotten from Steeda works as advertised and the customer service and "guidence" I have gotten from the folks at Steeda has been A+ as are the products.
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DIFM provides a competive suspension option
First off, I decided to go with Steedas DIFM option because I really did NOT want to mess with disassembling the old struts and reassembling the new ones. Recieving fully built struts with Steedas camber plates already installed saved me some headaches. Simply install the struts into the car when you get them! Secondly, the ride is most excellent. I chose the Progressive Sport spring option, because I most drive my car to and from work but autocross a few times a year. My car is a non-PP GT and rode more like a Cadillac in stock form. Not anymore. This setup really firmed it up, but not like you're in an old jeep. Now, instead of floating over railroad tracks, the car feels planted to ground, yet doesnt jar you to death. Lastly, Steedas reputation precedes them with the fit and finish of their products. The autcoross season ended before I could get these installed but I'm anxious to see how they do in course.
Did you find this helpful?  18 of 18 Found Helpful
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