hpi 97-06 ls1 standalone wire harness 4.8 5.3 6.0 vortec w/60a relay (drive by cable) (red/blue pcm) & ev1 fuel injector connectors (t56 (non electric) dbc) (t56 (non electric) dbc) high performance injectors come join our racing family. we take care of our customers with tech support and around the clock service. the difference with us and other amazon harness sellers is the customer service. you're not just buying a harness, you're buying into a team with years of professional experience. this harness is a 3 wire maf and a 1 wire alternator. comes with instructions. in stock for next day priority shipping as you can imagine, there is a lot that goes into making an engine harness. all of our harnesses are built with oem quality and better all harnesses are long enough for the pcm to be mounted under the dash. all harnesses have a high quality grommet installed on the harness (that slides for desired mounting) harnesses receive a quality check before shipment. gm color codes. many companies do not use gm color codes. high quality reinforced ring terminals 1200 degree fiberglass braid on all circuits ran by heat all factory cpa (connector position assurance locks) 100% handmade, right here in the u.s.a. harness comes with a complete install instruction packet. all harnesses come with the needed dash connections, which include speedometer, tachometer, park neutral, tcc, malfunction indicator, and a dlc port. 1997-2006 drive by cable ls1 engines 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 harness comes with a complete install instruction packet. made in the u.s.a if you have any questions please ask.