Subaru WRX STI EJ20 / EJ25 Supertech valve spring kit SPRK-TS1015-SU4

Springs data:

Seat pressure - 82lbs @ 34.25mm
Open (lift) pressure - 220lbs @ 11.5mm
Spring coil bind - 20.70mm
Rate - 12.10lbs/mm
Max lift - 13.50mm
Outer spring outer diameter: 27.50mm
Outer spring inner diameter: 20.00mm
Inner spring outer diameter: 20.00mm
Inner spring inner diameter: 15.20mm

Set includes:

Dual springs: 16 pcs. SPR-TS1015/SU4
Titanium retainers: 16 pcs. RET-TS60/WRX1
Seats: 16 pcs. SEAT-TS/SUB4