Swap Specialties 58x Standalone wiring harness for GM Gen3 4.8, 5.3, 6.0, and 6.2L Engines has many different options, to suit your build. We hand build every harness to fit exactly what your project needs. We use the highest quality TXL wire, brand new OEM connectors, weatherproof fuse and relay box, and finish it off with a multitude of covering options. Each harness is then tested on an actual engine dyno and double pinned to assure 100% thoroughly checked. With the best Warranty, tech support, and quality be assured your wiring will offer to be one of the best investments for your project. Use the selections to build your custom harness, or feel free to give us a call and we would love to personally walk you through your build.