Features: Reference part number: 490333707, 49033-3707. Applicable model: the fuel injectors are compatible for STX 12F 2003-2007, compatible for STX 15F 2004-2016. Premium material: the fuel injectors is made of metal and composite ABS plastic, function more consistent and smoother, more accurate adjustment to account for extremes of cold temperatures, fast starting up. Function: the injector is a fuel delivery component that is responsible for injecting gasoline or fuel into the combustion chamber, a valve that primarily receives and delivers fuel to the cylinder. It is electronically controlled to open and close completely or partially, depending on the data collected by various sensors. Energy saving: the fuel injectors are designed for optimum fuel atomization (mist) for increased performance and fuel economy. Specification: Product name: Fuel Injector Assembly Replacement. Material: metal. OE part number: 490333707, 49033-3707. Fitment: Compatible for STX 12F 2003-2007. Compatible for STX 15F 2004-2016. Package includes: 4 x Fuel Injectors