Originally Posted by OMRITIME
I have the jb4 g4 and I need to upgrade it to g5 because I'm getting the rb turbos
I understand i need the Cobb ap for the best tuning, so I need uninstall the jb?
I don't understand what is the difference between them?!
COBB is a flash tune through you OBDII. You can run both but need the proper tuning. There a threads out there that cover this.