Steeda S550 Mustang IRS Full Pack

€589 exc TAX

Our Steeda S550 Mustang Rear IRS Full Pack adds our IRS Subframe Braces for 2015+Mustang GT, GT350 and, EcoBoost, (non-convertible) models. Our IRS Base pack is a MUST HAVE. And this pack is better! An amazing bolt on transformation for your rear end! Homologated / Certified for European use

As a guide, EU delivery cost varies on service requested and weight / dimensions. Final rate depends on which EU Zone you are in for DPD services. Below are some guide examples. 

Some countries may be serviced with other providers if required.

FREE SHIPPING is available on orders over a certain amount (country dependant). Some product do not qualify for the free shipping offers due to the weight / size of the item. 

We aim to ship same day if ordered before midday.

1. Standard EU Shipping: DPD Courier with tracking - 2-3 days (for main EU countries)

DPD Zone 1: €14.99 + vat 0-5KG      - €19.99 5-30 KG

2. Small Items (via Royal Mail) -from 2 days - 2 weeks depending on location.

Covers all European countries:  €14.99 + vat 0-2KG:

You will receive a shipping notification with tracking details once order is processed.

NOTE  We can ship worldwide. Please contact us if assistance required as a custom shipping solution may be required.

We reserve the right to change charges and services as required.

With the release of the new S550 Mustang, Steeda knew that addressing the IRS system would be a top priority. Being the first production Mustang with an IRS since the 03/04 Cobra's, we knew there would be a great opportunity to capitalize on Ford's new piece by giving it the Steeda advantage. As with any suspension system, deflection is an issue if it's present. Anytime a piece is moving, twisting or vibrating when it should be stationary is a major problem. One of the areas team Steeda wanted to focus on was the rear IRS subframe.

As you have seen with our IRS Subframe Bushing Support System, it limits the movement of the subframe by filling in the voids of the OE bushings. With Steeda's IRS Subframe Support Braces, we have taken the S550 rear suspension to another level!

Our IRS Alignment Bushes simply lock the IRS subframe centrally, something you may be surprised to learn can be up to 1/2 out of alignment left or right from the factory. As you may guess, having a central alignment is pretty key to a good suspension alignment and so good handling performance!

What we did was tie together 3 very important points on the S550 chassis. We utilized existing threaded holes in the rocker panel (the strongest part of the body) and connected that to the front mounting location of the IRS subframe and the rear mount of the lower control arm and toe link. Connecting these 3 points together not only adds rigidity that was lacking in the rear, but also more control of the whole car.

Also, unlike competitors kits that only replace the factory bracket, our Steeda kit supports that bracket while connecting to 2 additional locations, therefore providing twice the support! Best part about this kit is it uses all existing holes in the chassis so the car doesn't have to be modified in any way and adds no NVH whatsoever.

Homologated / Certified for European use

Product Benefits

  • Better handling for more stable cornering
  • Limits IRS sub frame movement
  • No permanent modifications necessary
  • No added NVH
  • 50% more connecting points
  • Reduces wheel hop
  • Lifetime warranty
  • Homologated / Certified for European use
  • Installation does not require removal of cradle
  • Patent pending
  • Locks in rear IRS alignment centrally
  • The best overall IRS solution on the market!
  • Normally in stock

V8 & Ecoboost, Manual and automatic
Not For Convertible or Mach One / GT350

Pack Consists of:
555-4437 - IRS Subframe Support Bushes
555-4438 - IRS Alignment Bushes
555-5754 - IRS Subframe Braces

Install Guides:

555-4437 Install guide
555-4438 Install guide
555-5754 Install guide


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