Ferrea Dual Valve Spring Kit | 2008-2015 Mitsubishi Evolution X (KT4014)

Ferrea Racing
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$951.90 $1,057.67Instant Savings of 10% ($105.77)

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Valve Spring Kit for 2008-2015 Mitsubishi Evo X by Ferrea

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 valve springs are developed from high strength alloys, including premium grade chrome silicon steel.

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


  • Controls Dominant Harmonics
  • Provides Needed Stability
  • Reduce Valvetrain Component Wear
  • Developed from High Strength Alloys
  • Heat-Treated and Stress Relieved


  • 2008 - 2015 Mitsubishi Evolution X

What's In The Box?

  • 16 - Dual Springs (S10018)
  • 16 - Titanium Retainers (E11089)
  • 16 - Seat Locators (SL1096)
  • 16 - Valve Locks (K10091)


Ferrea Manufacturer's Warranty

Customer Reviews

Based on 1 review
Chris Schumaker
Daul Valve Springs

Great product. A must for high reving evo.