Welcome to LSx Harness . I can reconstruct,rewire,or rework your Stock 4.8, 5.3, 5.7 or 6.0 Ls harness into a Ls Stand Alone Harness,for your swap vehicle. We also reconstruct LT1 harness... I start by removing unneeded wires from your pcm connectors to slim it up a bit .(smaller cleaner harness) I remove all unneeded emission wires and connectors. I delete the two rear o2 sensors. At this point i build a 4 rail fuse box and add 2 relays for the ignition and fuel pump. I also add an obd2 port to your harness and cover it back up in loom. Please visit my face book page for customer reviews, its also lsxharness.com on Face book! Please don't forget to like us!