Xtreme-Grip™ Coilover System CorteX-JRi Dbl Adjustable, 2015-2020 Mustang S550 and GT350


SKU: CCK-50-1000-JRI-DA


This is a true coilover system both front and rear featuring CorteX Proprietary valving with JRi dampers.


These struts and shocks include all the geometry advantages of our other competition struts such as the ability to fit 10.5-11 in wide from wheels and 315mm tires.  Now they are available with the advantages of JRi damper technology.


CorteX Racing has developed Mustang-specific line of coil-overs based on years of street driving and track testing. This coil-over system apply race-winning technology to your vehicle by providing precision chassis control, ride height and geometry alignment. Installation is straightforward as coil-over hardware, springs, and all mounting brackets are included. With longevity and performance as priorities, all components use high-grade materials ideal for the application with durable finishes. Damper valving has been optimized and will take you to the next level of performance.

Options * 

GT350 Options

Both of these items are required to add our coilovers to a GT350 or GT350R


Xtreme-Grip Coilover System CorteX/ JRi Double Adjustable Shocks

Vehicles: 2015-2020 Ford Mustang S550, Shelby GT350, GT350R

Professionally engineered, proven endurance

CorteX coilover struts housing and shock mounts are some of the most rigorously tested components in the industry.  As former structural analysis engineers, we understand strength, deflection, and fatigue and how they apply to mechanisms such as suspension systems.  Every component we see undergoes both computer simulated finite element modeling as well as confirmation with real life use.  Purchase with confidence knowing you are getting the highest quality products possible with the most value.

Our strut housings and mounting brackets are built of bulletproof steel which offers more tire clearance and reduced weight compared to bulkier aluminum components.  Since struts see significant bending loads (unlike shocks which are mostly limited to tension and compression loads) stiffness of the housing is essential in order to minimize camber loss and prevent bending and component damage in the event accidental abuse from contact or an off-track excursion.  Engineers know that aluminum deflects 3 times more than steel however it is also 1/3 the weight.  What this means is that if you are designing a component for stiffness the aluminum needs to be 3 times thicker to have the equivalent stiffness of the steel parts.  With that knowledge it is easy to deduct that no weight will be saved by using aluminum in the design.  Steel also has superior fatigue properties than aluminum which means that it can be loaded closer to its limits over time (cycles) without fatigue failures.  Aluminum, in contrast, must be kept further below its load limits to avoid fatigue failure.  That is the exact reason that lightweight airplane components are replaced on a predetermined schedule since the engineers know how long the aluminum parts can safely be kept in service before a fatigue failure is likely to occur.

This system includes:


  • Struts Assembly with JRi Internals (pair)
  • Camber Plate (pair)
  • Camber slugs allowing high camber to be achieved by resetting the camber range on the strut body
  • Choice of Springs
  • All mounting hardware to complete the installation


  • JRi Double Adjustable dampers
  • Springs and appropriate valving
  • Coil over hardware
  • Mounting brackets and hardware

The JRI piston’s lower cross-section and reduced port length improves overall dynamic performance. These features coupled with JRI’s precise flow metering increase the hydraulic stiffness of the strut and improve its overall response. With its unique piston design, innovative components like the extension cage, and meticulous attention to sealing any unintended bleed paths, JRI struts have less hysteresis than competing manufacturer’s struts. The proprietary bearing carrier isolates side loads associated with misalignment that occur in normal strut operation. This is especially important with weight transfer. By design, more energy is dissipated through the fluid and NOT through the friction of the components. The JRI strut’s low friction seal design has less stick-slip than other leading strut manufacturers. The result is lower dynamic force and lower effective rate influencing your setup. This added adjustment feature allows the struts to not only adjust high speed extension, but also to adjust low speed compression or extension through the shaft.

2015, 2016, 2017, 2018, 2019, 2020

Additional information

Weight 60 lbs
Dimensions 30 × 14 × 10 in


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