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Ferrea Valve Springs - Subaru For ALL racing environments! Developed from high strength alloys Springs are heat treated and stress relieved = increase in spring's life! Provide stability needed for high lift and high RPM. Minimizes load loss for today's aggressive valvetrain combo's. "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." IMPORTANT: All Valve Springs require Retainers and Spring Seat Locators. See requirements listed under Part #'s.

Subaru WRX - EJ20 2024-08
Part #	Type	OD	ID	Seat Press	Open Press	Max Lift	Price/ Each	Buy Now
S10071	Dual Spring Special Alloy Turbo Drag Racing	20.8mm 28mm	25.88mm 20.8mm	75 lbs @ 39.4mm	200 lbs @ 29.4mm	15mm	$20.99
Valve Springs Require: 1) Ferrea Titanium Retainer #E11043 2) BOTH Ferrea Spring Seat Locator #SL1034 - Discard OEM Spring Seat Locator
S10072	Dual Spring Special Alloy Turbo Endurance Spring	20.8mm 28mm	16.51mm 20.8mm	70 lbs @ 39.4mm	165 lbs @ 29.4mm	15mm	$20.99
Valve Springs Require: 1) Ferrea Titanium Retainer #E11044 2) BOTH Ferrea Spring Seat Locator #SL1034 - Discard OEM Spring Seat Locator
Subaru WRX - STI 2024-08
S10097	Dual Spring Special Alloy Turbo Drag Racing	20.8mm 28mm	15.88mm 20.8mm	90 lbs @ 36mm	215 lbs @ 26mm	14mm	$20.99
Valve Springs Require: 1) Ferrea Titanium Retainer #E11064 2) BOTH Ferrea Spring Seat Locator #SL1051 - Discard OEM Spring Seat Locator
S10098	Dual Spring Special Alloy Turbo Endurance Racing	20.8mm 28mm	16.51mm 20.8mm	80 lbs @ 36mm	180 lbs @ 26mm	14mm	$20.99
Valve Springs Require: 1) Ferrea Titanium Retainer #E11065 2) BOTH Ferrea Spring Seat Locator #SL1051 - Discard OEM Spring Seat Locator
Subaru 2.5L EJ25D 1996-98
S10079	Dual Spring Special Alloy Turbo Drag Racing	20.8mm 28mm	16.51mm 20.8mm	90 lbs @ 33mm	190 lbs @ 23mm	12.5mm	$20.99
Valve Springs Require: 1) Ferrea Titanium Retainer #E11044 2) BOTH Ferrea Spring Seat Locator #SL1038 - Discard OEM Spring Seat Locator