So i have a stock b20b engine right now in my car, and i just got a gsr head to put on it. just wanted to know if i would need a Gsr harness for the head swap? also what else will i need ? i just have the bare head with mani.
thanks, plz lmk

 

You can simply add a vtec signal wire & bypass vtec pressure switch.
Run one wire from the vtec solenoid to the ecu and run a wire at the etc's vtps switch to the vts wire & your done.