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1998-2004 Mustang Cobra
with IRS Chassis Systems
 
The Proven Innovator - not an imitator!

GR40 Street System
The starter kit with a big bang for the buck.  Includes the foundation to make a street-driven Mustang into a smooth riding BMW killer.  This kit was configured to give you incredible hookup and although our basic system, it is worthy of the GR40 name in what it yields in cornering performance.  Koni Shocks & Struts, Lowering Springs  TorqueArm, Subframe Connectors, Caster/Camber Plates, Bump Steer Correction and Urethane front and rear Control Arm Bushings are all included in the kit.  Whether you drive your Mustang at the strip or in the twisties, this kit is guaranteed to yield significant performance improvements.  Compare what you get to the competition’s comparably priced kits and you will see that we offer the best performance value.

GR40 Super Street System
The addition of Griggs Coil Over Konis and rear lower control arms makes this kit pack a big punch.  Fully adjustable ride height, low un-sprung weight and ride quality that’s unobtainable with non-coilovers.  This is the perfect kit whether or not you have bigger and better plans in the future.  Again, compare this kit with the competition for bang for the buck. 

GR40 Autocross/Open Track System
Engineered for the serious Mustang driver that uses his car on the strip or the road course, and still drives on the street.   The kit includes the highest strength-to-weight ratio K-Member and front end components on the market.  Fully revised and proven front-end geometry provides unparalleled turn-in and steering accuracy and dramatically improved braking.  

GR40 World Challenge/American Iron System
The kit that won it all.  THE standard of excellence.  The most popular chassis system in late-model road racing history.  Twelve years on the market and still dominant.  The proof is in the race records.  If you want to be consistently fast you need the World Challenge Kit.  If you don’t win with this, its time to check your driving.  There is no comparison for this one.  And race parts with a lifetime warranty…really.

    Price   Product Name   Model   Buy Now 
 GR40 Street System <br>('99-'04 Cobra IRS)   $2,415.35   GR40 Street System
('99-'04 Cobra IRS)
 
 GR40 S-99IRS  Buy Now 
 GR40 Super Street System ('99-'04 Cobra IRS)   $2,831.30   GR40 Super Street System ('99-'04 Cobra IRS)   GR40 SS-99IRS  Buy Now 
 GR40 Autocross/Open Track System - Front Strut ('99-'04 Cobra IRS)   $5,332.10   GR40 Autocross/Open Track System - Front Strut ('99-'04 Cobra IRS)   GR40 AP-99-SIRSCO  Buy Now 
 GR40 Autocross/Open Track System - Front SLA ('99-'04 Cobra IRS)   $7,039.05   GR40 Autocross/Open Track System - Front SLA ('99-'04 Cobra IRS)   GR40 AP-99-SLAIRSCO  Buy Now 
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Please note: Prices are subject to change.
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