Think i've got all the wiring needed now.. Got the Toyota usb mod cable to retain my usb connection in the arm rest. also got a link to the connects 2 full wiring system for the 2015 STI.
One last thing... did you require a fascia for your double din unit in the STI I've noticed that connects 2 sell a complete kit with the full stereo surround but it's just plain black and I would like to keep the carbon fibre look.
thanks again