Only the main harness (see what's included below).
GEN III:

• 5.7L LS1/LS6

GEN IV:

• 6.0L LS2
• 6.2/7.0 LS3/LS4/LS7/LSX/LS9

• For E-Throttle and Hella E-pedal
• Prepared for turbo applications with a boost solenoid connector
• Bosch JPT injector connectors
• Uses stock coils
• To be used with GEN IV knock sensors
• MAP sensor hose inside harness
• 8 pcs EGT connectors in harness
• Easy to rewire to be used without E-Throttle if needed

See tech docs for more information.