Excess Loom - PlugIn ECUs Want to add more inputs and outputs to your Link Plugin ECU? Use the XS Loom. This cable connects to the expansion port on all Link G4, G4+ and G4X plug-in ECUs. The number of extra inputs and outputs depends on your ECU modelsee the specifications for more information. Common uses include: Boost pressure adjustment via knob or switch Wide-band AFR/Lambda sensor Oil pressure sensor Fuel pressure sensor Intake air temperature (IAT) sensor Map switching (toggle between different settings with a switch) The XS Loom is 2.5 meters long and uses 20AWG cable.