Skunk2 521-99-1170 Race Coil Spring Elliptical 6in 2.5in ID 18kg/mm

The Skunk2 521-99-1170 is an elliptical-profile replacement race spring designed for use with Skunk2 Pro-C and Pro-S II coilover systems. With a 6-inch free length, 2.5-inch inner diameter, and an 18 kg/mm spring rate, this spring gives performance-oriented drivers the ability to fine-tune their suspension setup for the ideal balance between daily usability and track-ready handling.

Skunk2 Race Springs are sold individually, giving experienced tuners the flexibility to mix and match spring rates for custom suspension configurations. These are the same springs found in Skunk2's own coilover kits, ensuring proper fit and function within the Pro-C and Pro-S II platforms.

Key Features:

• Spring Length: 6 inches (free length)
• Inner Diameter: 2.5 inches
• Spring Rate: 18 kg/mm (~1,005 lb/in)
• Profile: Elliptical (tapered end coils for improved coilover compatibility)
• Material: CNC-wound SAE 9254V high-quality spring steel
• Finish: Shot-peen stress relieved with powder coat and phosphate corrosion protection
• Direct replacement for Skunk2 Pro-C and Pro-S II coilover systems
• Sold individually — price is per spring

Built to Skunk2's exacting quality standards, this race spring delivers consistent performance and long-term durability. Note: Replacement Race Springs are designed exclusively for use with full-bodied coilover assemblies and are not intended as standalone lowering springs.