Ferrea Endurance Dual Spring Kit 70lbs - 02-05 WRX EJ20 - KT4018 Timing Chain rock solid boost control and

rock solid boost control and an increase in torque and horsepower

The overall length is the same as our current K-Series Race-Spec Cables designed to fit common swap cars (EF/EG/DC2/EK and others)

2005:GMC:Savana 2500:Base

2001:Ford:Windstar:SE Sport

Skunk2 engineers then test and prove their designs on the engine dyno as well as the race track

Ferrea Endurance Dual Spring Kit 70lbs - 02-05 WRX EJ20 - KT4018 Timing Chain rock solid boost control andThe design and processes on these dual valve springs are optimized to reduce valvetrain harmonics and provide greater stability on high horsepower applications. We use high grade premium super clean PAC alloy materials and maintain tight tolerances for those unique aftermarket cylinder heads. Ferrea Subaru WRX EJ20 Endurance Dual Spring Kit Fitment: 2002: Subaru: Impreza: WRX, 2003: Subaru: Impreza: WRX, 2004: Subaru: Impreza: WRX, 2005: Subaru: