IAG Spec Street Series Coilovers by Fortune Auto | 2015-2021 WRX/STI

IAG Performance and Fortune Auto have combined forces to bring you the IAG Spec Street Series Coilovers by Fortune Auto, designed specifically for 2015-2021 Subaru WRX and STI models. These single-adjustable coilovers strike an ideal balance between daily comfort and occasional track performance, improving handling and road feel without sacrificing ride quality. This complete front and rear kit delivers proven performance at an affordable price.

Rather than offering an off-the-shelf solution, IAG Performance worked closely with Fortune Auto to refine the Fortune Auto 500 platform for real-world Subaru use. Extensive testing and development led to key improvements in suspension travel, damping behavior, and overall balance. The result is a coilover system that feels compliant and composed on the street while remaining capable during spirited driving and track days.

Custom IAG-spec shock valving and extended suspension travel allow the dampers to operate within their optimal range, even on lowered vehicles. The front spring rate and increased spring length improve weight transfer under braking and acceleration while reducing the likelihood of bottoming out. With 24 clicks of rebound and compression adjustment, the suspension can easily be tuned from a comfortable daily setup to a more aggressive performance-focused configuration.

An included 1-inch extended top hat helps preserve usable shock stroke, maintain correct preload, and reduce stress on internal components. Lightweight T6061 aluminum camber plates and spring perches minimize weight without compromising strength, while chrome-silicone springs provide durability and consistent performance for both street and track use. Fortune Auto’s Flow Digressive piston technology delivers firm control during low-speed chassis movements and softens automatically over sharp impacts, providing excellent grip, stability, and comfort across varying road conditions.

Front suspension specifications:

• 127mm shock stroke

• 270mm shock body

• custom IAG-spec valving

• 8-inch spring length

• 7kg/mm spring rate

  
  

Rear suspension specifications:

• 100mm shock stroke

• 200mm shock body

• Custom IAG-spec valving

• 7-inch spring length

• 8kg/mm spring rate.