Ferrea 12-15 Scion/Subaru FR-S/BRZ Single Spring Kit

The Ferrea Single Spring Kit is a high-quality valve spring upgrade designed specifically for the Scion FR-S (2013–2016), Subaru BRZ (2013–2020), and Toyota 86 (2017–2020). This kit is engineered to enhance the valvetrain performance of your vehicle’s naturally aspirated engine, providing improved durability and reliability under spirited driving conditions. It controls dominant harmonics, provides stability, and reduces valvetrain component wear. The springs are developed from high-strength alloys, including premium-grade chrome silicon steel, and are heat-treated and stress-relieved to increase life. They support increased RPM limits and aggressive camshaft profiles without compromising reliability, and are precision wound to maintain consistent spring pressure and valve seating force.