Flatout Suspension 15-21 Subaru STI [CS] CS-1521STI

DISCLAIMER: This is a made to order item. The lead time for this product is 4-8 weeks.

Flatout Suspension ClubSport Coilovers for 2015–2021 Subaru STI

Upgrade your Subaru STI with the Flatout Suspension ClubSport Coilovers, engineered for drivers seeking precise handling, track-ready performance, and daily street comfort. Designed for street, autocross, and club racing applications, this system provides dual height adjustment, 20-point rebound tuning, and inverted monotube shocks with external reservoirs for maximum control and reliability.

The coilovers offer a front and rear height adjustment range of 0.5" to 2" below OEM, delivering an aggressive stance while maintaining proper suspension geometry. CNC machined high-flow aluminum pistons, stainless steel shims, and electro-plated nickel shock bodies provide superior damping under high-load conditions. Eibach linear rate springs (450F / 450R) improve handling precision and stability.

Front assemblies include radial bearings for smooth steering response, and lower mounts feature brackets for sensor line routing. The system is modular, rebuildable, and reuses OEM top mounts. Individual parts are available for maintenance and upgrades.

Each set is hand-assembled in the USA and backed by a 3-year warranty against defects. Approximate hand assembly and shipping time is 3 weeks.

FITMENT

Fits:
2015–2021 Subaru STI

Height Adjustment Range

Front: 0.5" to 2" lower than OEM
Rear: 0.5" to 2" lower than OEM

Key Features

• Designed for Street and Track

• 2 Front Inverted Assemblies

• 2 Rear Inverted Assemblies with External Reservoirs

• Radial Bearing on Front Assembly

• Eibach Linear Rate Springs (450F / 450R)

• Dual Height Adjustable

• 20-Point Rebound Adjustment

• Rebuildable Monotube Shock

• CNC Machined High-Flow Aluminum Piston

• Stainless Steel Shims

• Electro-Plated Nickel Shock Bodies

• Medium Weight Synthetic Shock Oil

• Brackets for Sensor Lines on Lower Mounts

• Individual Parts Available

• 3-Year Warranty Against Defect

• Assembled in the USA

• Approx. 3-Week Hand Assembly Lead Time