AGS 4.0 GT-4 Suspension System

Kenny's Fourth Generation AGS Suspension System - 2005-2013 Mustangs

"The Perfect Street and Track Day Suspension Package"

The Kenny Brown AGS 4.0 Mustang Suspension is "standard equipment" on his awesome new GT-4CS and GT-4T Mustangs, engineered and track-tested to be a complete solution, with all the right pieces and Kenny’s advanced suspension geometry.  Kenny leverages what works in the Mustang and fixes what doesn’t with no band aid approach, no fluff, no puff, no excuses. It's one killer suspension system to make you look and feel good at the track, or just cruising the boulevard.


Chassis Support

  • 2-pt Heavy-Duty Strut Tower Brace (Non-Supercharged Cars)
  • Jacking Rails
  • Extreme Matrix Brace
  • Lower K-member Cross Load Brace
  • Optional: Light-weight Radiator Core Support


Advanced Geometry Front Suspension

  • GT-4 Advanced Geometry Front Lower Control Arm Module with Kenny’s AGS Geometry
  • Camber Adjustment Bolts 
  • Urethane Front Sway Bar Bushings
  • Optional: Light-weight Front Tubular K-member
  • Optional: 36mm front Sway Bar


Advanced Geometry Rear Suspension

  • AGS 3-link with Kenny’s AGS Geometry
  • Adjustable Rear Lower Control Arms (Rod-End at Chassis / Urethane at Axle)
    • Optional: Double Adjustable Rear Lower Control Arms (Rod-End at Chassis and Axle)
  • K-Link Upper Control Arm Module (Rod-End at Chassis)
  • Anti-Squat Traction Brackets
  • Revised Roll Center Panhard Brackets
  • Double Adjustable Panhard  Bar (Rod-End at Chassis and Axle)


Optional Shocks & Springs

  • Kenny and his crew work with each customer to determine the right combination for the intended use – Street, Open-Track, or Racing


The new AGS 4.0 GT-4 Front Lower Control Arm modules address all the shortcomings of the factory suspension; adding more caster, improving camber gain through the corners, increasing anti-dive for better braking, adjusting roll center, and dramatically refining the overall dynamics of the car.  For serious competition and performance, Kenny has also released a new Light-Weight Tubular K-Member that makes front suspension geometry improvements easier, and reduces weight considerably.  Also included in the front suspension kit are Camber Adjusting Bolts to optimize the camber settings, and Urethane Front Sway Bar Bushings to improve roll-stiffness without having to change the entire sway bar.  Larger front sway bars are optional.

The Kenny Brown Adjustable Rear Lower Control Arms combined with the Anti-Squat Traction Brackets firmly plant the power and grip at all four wheels by increasing anti-squat and anti-lift for improved traction off the line or at corner exit, and maximized braking capacity.  More magic comes from the U-Link Rear Upper Control Arm Module.  Kenny refers to it as a module because it lengthens the upper arm helping to reduce instant center migration, and adjusts the chassis mounting location to mirror the side view geometry that he has used for many years.  The Roll-Center Relocation Kit and Competition Panhard Bar work together to lower and completely change the roll center at the rear of the car allowing it to be in plane with the front roll center, in fact the need for a big rear sway bar is mitigated as a result of the improved geometry.  "Typically I’ll run my car with no rear sway bar.  For faster tracks like Mosport or Atlanta, I recommend a small OE rear sway bar", according to Brown.

Kenny never forgets the chassis, and for the new 2005-2012 Mustang suspension, he pulls a page out of his racing playbook.  The Jacking Rails are a by-product of his racing days and not only serve as a quick and easy way to jack the car up, but also increase rigidity along the rocker panel.  The Extreme Matrix Brace ties the Jacking Rails together with the frame to create an incredibly strong platform, and support big horsepower and grip.  The Heavy-Duty 2-Point Strut Tower Brace ties the strut towers together to manage the loads generated under hard cornering, abrupt braking, and ride quality also gets a boost.  The 2-Point Lower Chassis Brace, just like the strut tower brace, offers the same effect by tying both sides of the K-member together where the front suspension mounting points are.

Once everything in the suspension is moving and articulating appropriately, shocks/struts and springs ARE KING, so Kenny offers a range of pre-engineered packages rather than a cookie-cutter type of package.  It all can be confusing and expensive if you make the wrong choices – that is unless Kenny does it for you.  Customers can draw from his 25 years of experience to help select the right spring and shock package for their driving or racing requirements, while considering the cars ultimate potential.

The end result of Kenny's advanced geometry chassis and suspension changes are equivalent to a whole new car with superior handling, grip, and performance that is only rivaled by the best sports cars the world has seen!  What's even more spectacular is the system basically bolts on with the exception of the weld-on chassis parts, and you can transform your Mustang, Boss 302 or Shelby GT500 in just one week.

Heritage of Kenny Brown Advance Geometry Mustang Suspension Systems

1987-1992 AGS Gen-I
(Saleen-R & Fox Mustang)
Revised Front K-Member Geometry

1993-2000 AGS 2.0 Gen-II
(Fox Mustang, SN-95 Mustang)
AGS Fixed-Strut Front Geometry
AGS TracKit Plus Rear Geometry

2001-2004 AGS 3.0 Gen-III
(SN-95 Mustang)
AGS Tubular K-Member and Control Arms
AGS Rear IRS Module

2005-2013 AGS 4.0 Gen-IV
(S-197 Mustang)
AGS Tubular K-Member and Control Arms
AGS 3-Link Live Axle Rear Geometry

Kenny Brown Heavy-Duty 2-Point Strut Tower Brace

  • Improves Handling
  • Reinforces Strut Towers
  • Improves Ride-Quality
  • Helps Manage Load Under Hard Cornering

Kenny Brown Heavy-Duty 2-Point Lower Chassis Brace

  • Reinforces K-Member
  • Reduces Torsional Twist
  • Improves Ride-Quality
  • Helps Manage Load Under Hard Cornering

Extreme Matrix System

  • The Ultimate in Under Car Chassis Support
  • Stiffens the chassis, improving ride quality and handling
  • A MUST for all convertibles and hard driving applications
  • Helps reduce squeaks and rattles
  • Creates a full frame under your Mustang
  • No loss of ground clearance
  • Built-in jacking rails for added convenience

AGS 4.0 Light-Weight Tubular Front K-Member

  • Designed to work with Super-Grip AGS 4.0 control arms
  • For Street, Track or Competition use
  • Reduces weight for better balance
  • Strong and Light-weight tubular Design

“Super-Grip” Front Lower Control Arm Module

  • The strongest front lower control arm for 2005-2013 Mustangs
  • 3-D CAD designed with FEA analysis that is track proven
  • Incredible braking and handling
  • Kenny’s exclusive AGS 4.0 Geometry
  • Improves Roll Center Migration, Caster, Camber Gain and Anti-Dive
  • Critical part of AGS 4.0 GT-4 Suspension System
  • Performance or track springs required

Street/Sport Adjustable Rear Lower Control Arms

  • Improves grip, handling, and control
  • Less deflection and more traction
  • Light-weight, heavy-duty design
  • Low-friction bushings and competition-grade rod ends

Anti-Squat Traction Brackets

  • Dramatically improves traction, grip, and braking
  • More bite off the line and grip out of the corners
  • Must have for open-track, strip or street performance
  • Cost-effective and easy bolt-in installation

U-Link Rear Upper Control Arm Module

  • Improves critical aspects of the rear suspension geometry
  • Improves anti-squat/ anti-lift
  • Lightweight, heavy-duty design for increased strength
  • Critical part of Kenny Brown’s awesome GT-4 Suspension System
  • Essential for all lowered Mustangs and performance driving

Roll Center Relocation Kit with Double-Adjustable Panhard Bar

  • Dramatically improves handling
  • Street friendly – Track proven
  • Adjustable mounting brackets for lower ride height
  • Double-Adjustable Panhard Bar with competition-grade rod ends
  • MUST HAVE for open-track or performance street
  • Includes upper panhard reinforcement brace

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