Link ECU XS Expansion Loom - #XSLWant to add additional inputs output to your Link Plugin ECU? Use the XS Loom. The Link XS Loom plugs into the expansion connector on all Link G4, G4+ and G4X plug in ECUs. The number of extra inputs and outputs added by the XS Loom is dependent on the Plugin ECU. For specific details check the plug in ECUs specifications. Common applications include but are not limited to: Boost adjustment knob or switch Wide band AFR Lambda Oil Pressure Sensor Fuel