Harness package for use with the 6.6L L8T engine with 6L80/6L90 transmission. Includes the following:

L8T standalone wiring harness
Programmed ECM with base calibration (Fine tuning may be required locally)
Reprogram YOUR supplied T43 TCM (You must ship us your TCM after placing the order)
Front oxygen sensors
4-wire fuel rail pressure sensor
MAF sensor with bung
ETC pedal

Optional add-on: FPCM with -6AN inline fuel pressure sensor - for use with OEM GM "in the tank" fuel pump return-less style fuel setup $250