Ferrea Dual Valve Spring Kit for 4G63 Evo 4-9 (KT4013) Zeitronix These pistons feature skirt diameters

These pistons feature skirt diameters that correspond to the OEM Grade 1

68 11104007219 S Cover Ported T4 Inlet V-Band Outlet

replacing every core component in the OEM system

Xtreme (N024X)

(A battery can be one of the above types and MF)

Ferrea Dual Valve Spring Kit for 4G63 Evo 4-9 (KT4013) Zeitronix These pistons feature skirt diametersFerrea dual valve spring kit for the Evo 4 5 6 7 8 9 includes a full set of 16 dual springs, titanium retainers, seat locators and valve locks. Vehicle Fitment: 1996 2006 Evolution IV V VI VII VIII IX Includes: (16) Dual Springs (S10084) (16) Titanium Retainers (E11052) (16) Seat Locators (SL1041) (16) Valve Locks (32 pieces) (K10035) More Info: Ferrea valve springs are heat treated and stress relieved, which dramatically increases the spring's life.