Ferrea Valve Spring Titanium Retainer (16.51mm) Subaru WRX / STI EJ25 2004-2021 (QTY 16) Vehicle Model_WRX STI increases stiffness and prevents flex

increases stiffness and prevents flex in the chassis behind the rear bumper support

Can be returned to stock just as fast

ARP head studs are manufactured to such exacting tolerances

Part Number: BMF55Z

billet female inner CV and a direct fit outer CV that will fit the factory wheel hubs and have a 1-year warranty

Ferrea Valve Spring Titanium Retainer (16.51mm) Subaru WRX / STI EJ25 2004-2021 (QTY 16) Vehicle Model_WRX STI increases stiffness and prevents flexPart #: E11065 SUBARU IMPREZA WRX STI (2004 2017) TITANIUM RETAINER Valve Stem Size: 6 mm Diameter (A): 25. 40 mm Inn Step Diameter (C): 16. 51 mm References: Double Spring 6 deg Pro CNC Ferrea Valve Lock # K10074