Skunk2 541-05-8780 Pro-ST Coilovers 12-Way Adjustable for 17-21 Honda Civic Si

Vehicle Fitment

• 2017-2021 Honda Civic Si Sedan 1.5L Turbo (FC1)
• 2017-2021 Honda Civic Si Coupe 1.5L Turbo (FC3)

Fitment Notes

• Complete coilover system for front and rear
• Includes front camber plates for alignment adjustability
• Lowers vehicle approximately 3 inches below factory ride height
• Maintains full suspension travel when properly installed
• Professional alignment recommended after installation

Features

• 12-way adjustable damping from street comfort to track firm
• 52mm seamless carbon steel mono-tube shock bodies
• High-pressure nitrogen-filled dampers with synthetic shock oil
• Larger hydraulic piston and valves for improved response
• Linear rate springs for consistent feedback under varying loads
• AE9254V Chrome Vanadium CNC-rolled coil springs
• Shortened shock bodies retain proper suspension geometry
• Knurled adjustment knobs accessible without wheel removal

Specifications

• Part Number: 541-05-8780
• Brand: Skunk2 Racing
• Series: Pro-ST
• Type: Full Coilover System
• Damping Adjustment: 12-Way
• Front Spring Rate: 10 kg/mm (560 lbs/in)
• Rear Spring Rate: 8 kg/mm (448 lbs/in)
• Spring Type: Linear Rate
• Spring Diameter: 2.5 inches
• Spring Material: AE9254V Chrome Vanadium
• Shock Body: 52mm Carbon Steel Mono-Tube
• Damper Type: Oil/Nitrogen Filled
• Warranty: Lifetime

Included Components

• 2 Front Coilover Assemblies
• 2 Rear Coilover Assemblies
• Front Camber Plates
• Adjustment Wrenches
• Mounting Hardware

Product Description

The Skunk2 Pro-ST coilover system delivers race-proven suspension technology in an affordable street-focused package for 2017-2021 Honda Civic Si models. Large 52mm seamless carbon steel mono-tube bodies house precision-valved dampers with high-pressure nitrogen and synthetic oil for exceptional compression and rebound response. Linear rate AE9254V Chrome Vanadium springs (10kg front, 8kg rear) provide consistent handling feedback across varying loads. The 12-way adjustable damping allows quick tuning from comfortable street settings to aggressive track performance without removing wheels. Engineered based on decades of Skunk2 professional racing experience.