IAG Performance and Fortune Auto have partnered to bring you the IAG Spec Street Series Coilovers by Fortune Auto, designed specifically for 2008–2014 Subaru STI models. These single-adjustable coilovers offer an ideal balance between daily comfort and occasional track performance, improving handling and road feel without sacrificing ride quality. This complete front and rear coilover kit delivers proven performance at an affordable price point.
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. Through extensive testing and development, key changes were made to improve suspension travel, compliance, and overall balance. The result is a coilover system that feels composed on the street while remaining capable during spirited driving or track sessions.
These coilovers feature custom IAG-spec shock valving along with extended suspension travel to maintain proper damper operation even on lowered vehicles. The combination of an optimized front spring rate and increased spring length improves weight transfer during braking and acceleration while reducing the risk of bottoming out. With 24 clicks of rebound and compression adjustment, the suspension can be easily tuned from a comfortable daily setup to a more aggressive performance-oriented feel.
An included 1-inch extended rear top hat allows the shocks to operate within their optimal range, preserving usable stroke, maintaining correct preload, and reducing stress on internal components. Lightweight T6061 aluminum camber plates and spring perches keep weight down without compromising strength, while chrome-silicone springs provide durability and consistent performance for long-term street and track use.
Fortune Auto’s Flow Digressive piston technology delivers firm control during low-speed chassis movements while softening automatically over sharp impacts and rough roads. This adaptive damping provides excellent mechanical grip, stability, and comfort across a wide range of driving conditions.
