Speartech is your LSX wiring harness swap specialist. We offer LSX swap harnesses for all LSX engines including LS1, LS2, LS3, LS6, LS7, LSA, LS9, Gen 5 V8, LT1, LQ4, LQ6, L99, Vortec variants - DOD, VVT, AFM. Speartech also provides LSX ECM programming (including E38, E67, E40 E37), LSX engine wiring harness reworks and conversion, adapters, and programming harnesses. Put 23 years of GM Engineering experience to work for you! Go with the name that leads the way in GM LSX engine swap harnesses, Speartech Fuel Injection Systems, Inc.!