Ferrea Valve Springs for 17-20 Honda Civic Si L15 21.35mm OD 14.98mm ID Alloy...

Ferrea Valve Springs for 2017–2020 Honda Civic Si (L15) Brand: Ferrea — engineered performance and durability for enthusiasts and tuners. Upgrade your 2017–2020 Honda Civic Si L15 with precision Ferrea single valve springs designed to deliver consistent valve control and reliable high-RPM performance. Outer Diameter: 21.35mm Inner Diameter: 14.98mm Material: High-strength alloy for fatigue resistance Quantity: Set of 4 These springs provide superior seat stability and reduced surge under aggressive cam profiles and boosted applications. Ferrea’s manufacturing standards ensure tight tolerances and long service life, making them ideal for street, track, and performance builds. Benefits: improved valve control, increased RPM capability, enhanced durability, and consistent spring pressure for optimized engine response. Compatibly engineered for the L15 engine in 2017–2020 Honda Civic Si models. Install as a matched set for best results.