Ferrea Subaru WRX STI Endurance Dual Spring Kit

KT4020

Harmonics or high-frequency fatigue is present in all racing engines and will usually destroy the valvetrain if not controlled. Properly designed valve springs will control the dominant harmonics, provide the needed stability, and reduce valvetrain component wear. Ferrea Racing Components valve springs are developed from high strength alloys, including premium grade chrome silicon steel.

Ferrea Racing Components springs are heat-treated and stress relieved, which dramatically increases the spring’s life. The company's valve springs provide the stability needed for high lift, and high rpm racing engines while minimizing the load loss for today’s aggressive valvetrain combinations.

Features:

• Controls dominant harmonics
• Provides needed stability
• Reduce valvetrain component wear
• Developed from high strength alloys
• Heat-treated and stress relieved

Application: All Subaru WRX STI models