This AccuAir 1 foot ECU to VU4 harness is a direct replacement for the factory harness found in your AccuAir kits. It is a plug-n-play harness that connects your e-level ECU to your VU4 manifold. Depending on where you may have your setup mounted, your harness could become damaged due to components rubbing against the harness or having your harness strained if not secured properly. This replacement harness is designed to be a simple solution to get your wiring back in tact quickly and easily.