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Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
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Ferrea
Ferrea Endurance Dual Valve Spring Kit for Subaru WRX STI - KT4020
This product will be available for sale in 2 weeks, but you can pre-order now to receive 10% discount!
The Ferrea Endurance Dual Valve Spring Kit (KT4020) is engineered to provide the valvetrain stability required for high-performance and track-driven Subaru WRX STI engines. By utilizing a precision-wound dual-spring design, this kit effectively manages valvetrain harmonics and prevents valve float at high RPMs, protecting your engine during aggressive driving or high-boost conditions.
Each spring is manufactured from high-tensile premium alloys and subjected to specialized heat-treatment processes to ensure consistent spring rates and long-term durability under extreme thermal stress. This kit is a critical upgrade for owners looking to improve valvetrain control and reliability beyond the limits of factory components.
- Fits Subaru WRX STI
- Series: Endurance Dual Spring Kit
- Engineered to prevent valve float and maintain timing accuracy at high RPM
- Premium alloy construction for superior fatigue resistance
- Manufacturer Part Number: KT4020
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Atlus
1340 Cobb Dr, Unit 1, Eustis, FL 32736
352-234-4458
Mon – Fri: 8:30 am – 4:30 pm
Sat: 9:00 am – 2:00 pm
Sun: Closed
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Ferrea Endurance Dual Valve Spring Kit for Subaru WRX STI - KT4020
This product will be available soon, but you can pre-order now to get on the list before others!
US Based Support - In Florida
30 Days Satisfaction Guarantee
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The Ferrea Endurance Dual Valve Spring Kit (KT4020) is engineered to provide the valvetrain stability required for high-performance and track-driven Subaru WRX STI engines. By utilizing a precision-wound dual-spring design, this kit effectively manages valvetrain harmonics and prevents valve float at high RPMs, protecting your engine during aggressive driving or high-boost conditions.
Each spring is manufactured from high-tensile premium alloys and subjected to specialized heat-treatment processes to ensure consistent spring rates and long-term durability under extreme thermal stress. This kit is a critical upgrade for owners looking to improve valvetrain control and reliability beyond the limits of factory components.
- Fits Subaru WRX STI
- Series: Endurance Dual Spring Kit
- Engineered to prevent valve float and maintain timing accuracy at high RPM
- Premium alloy construction for superior fatigue resistance
- Manufacturer Part Number: KT4020
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