1.All of our harnesses are built with OEM Quality and better 2.All Harnesses are long enough for the PCM to be mounted under the dash (ADDED 36" FOR EASY COMPUTER MOUNTING) 3.All Harnesses have a High Quality Grommet installed on the Harness (THAT SLIDES FOR DESIRED MOUNTING) 4.Harnesses receive a quality check before shipment. 5.GM Color Codes. Many Companies Do NOT Use GM Color Codes. 6.High Quality Reinforced Ring Terminals 7.1200 Degree Fiberglass Braid on All Circuits Ran by Heat 8.All Factory CPA (Connector Position Assurance Locks) 9.All harnesses come with the needed Dash Connections, which include Speedometer, Tachometer, Park Neutral, TCC, Malfunction Indicator, and a DLC Port. ADDED FEATURES INCLUDE 36" ADDED LENGTH FOR EASY COMPUTER MOUNTING UPGRADED WIRE FOR RUNNING THOSE BIG INJECTORS (will run any size injector without issues) UPGRADED 60-AMP RELAYS Compatibility: Drive By Cable LS1 Engines 1997-2006 EV1 Injector Connectors Package Included: 1 x Harness