Mitsubishi EVO Injector Set: 4 x 850cc Low Impedance Ball & Seat Injectors. Delphi Low Impedance Injector. Set of 4. Delphi EV1 Low Imp Injector All injectors are checked @43.5psi and flow matched in sets of 4 to 1% of each other Injectors are Machined TOP and BOTTOM for a no hassle Installation.