Piston-Tuned Control for the 2005-2007 STI

Fortune Auto Gen 8 510 Series coilovers for the 2005-2007 Subaru STI. They are designed to improve handling, ride quality and stance. The 510 Series is a single adjustable coilover built around the revised Concave Flow Digressive Piston, which gives a wide adjustment range while staying rebuildable and upgradeable. With 24-step simultaneous rebound and compression adjustment, most setups can be tuned without revalving. Fortune Auto chrome silicone springs are included; choose your front and rear spring rates from the dropdown menus.

Built to Fit: 2005-2007 STI

Inside the 510: Piston to Top Plate

• Single adjustable, 24-step simultaneous rebound and compression adjustment
• Revised Concave Flow Digressive Piston, updated to the 6XXX alloy series with optimized high-flow valves
• Monotube damper with high-pressure nitrogen
• Amsoil synthetic shock oil
• Custom-built, with assembly certificate and dyno graph included
• T6 6061 aluminum mounts and camber plates
• Laser-etched top plates, locking spring perches and lower mount locking rings
• Rebuildable and revalveable at Fortune Auto's Richmond, VA facility
• Fortune Auto states the piston supports a spring rate range of up to 8 kg, versus about 2 kg for a conventional damper
• Springs: Fortune Auto chrome silicone springs, default 8K front / 6K rear, with other front and rear rates available from the dropdown menus

In the Box: Silicone Springs, Dyno Paperwork

• Fortune Auto Gen 8 510 Series coilovers for the application listed
• Springs: Fortune Auto chrome silicone springs, default 8K front / 6K rear, with other front and rear rates available from the dropdown menus
• Assembly certificate and dyno graph

Straight from SubiSpeed

We suggest the 510 for owners who want a wider damping range to tune, from comfortable daily driving to aggressive track use. Pick your spring rates for how the car is actually driven before you check out, and message us if you want a second opinion. These are built to order, with Fortune Auto listing lead time at 7-9 weeks, so order ahead of your install date. Book an alignment right after installation, and a corner balance if the car sees track time.