Shop Now IAG Spec Street Series Coilovers by Fortune Auto 2005-2007 STI

IAG Performance and Fortune Auto have teamed up to bring you the IAG Spec Street Series Coilovers by Fortune Auto, designed for 2005–2007 Subaru STI models. These single-adjustable coilovers strike an ideal balance between daily comfort and weekend performance, improving handling and road feel without sacrificing ride quality. This complete front and rear coilover kit delivers excellent performance at a great value.

Rather than offering an off-the-shelf solution, IAG Performance worked closely with Fortune Auto to refine the proven Fortune Auto 500 platform into something better suited for real-world driving. 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 and comfortable on the street while remaining capable during spirited driving or occasional track use.

These coilovers feature custom IAG-spec shock valving and 10mm of extended shock travel front and rear, allowing the dampers to operate in their optimal range even on lowered vehicles. This added travel improves ride quality, traction, and control while reducing harshness over uneven roads. Fortune Auto’s Flow Digressive piston technology delivers firm, controlled damping during low-speed chassis movements, then softens automatically over sharp bumps or rough pavement for improved grip and comfort.

The IAG Spec Street Series Coilovers are constructed with lightweight T6061 aluminum camber plates and spring perches for strength without unnecessary weight. The chrome-silicone alloy springs provide excellent durability and consistent performance, making this setup well-suited for long-term street use with the capability to handle aggressive driving when needed.

Front suspension specifications:

• 127mm shock stroke
• 270mm shock body
• custom IAG-spec valving
• 8-inch spring length
• 7kg/mm spring rate

Rear suspension specifications:

• 127mm shock stroke
• 300mm shock body
• custom IAG-spec valving
• 9-inch spring length
• 6kg/mm spring rate

Note: Optional GC rear conversion top hats are available, these coilovers can also be used on 1993–2001 Imprezas converted to STI rear knuckles. GC rear top hats are sold separately and do not come installed.