In order to fit uprated injectors to your Subaru, you would generally need to cut the existing plugs from your wiring loom, and re-attached the plugs supplied with your injectors to enable them to fit on the loom.
Our Plug & Play kit gets rid of the need for this process, and allows you to simply plug into your existing loom with these adaptors, and then into your uprated injectors, for a completely OE looking installation, without the headache of adapting the loom.