[dfink]

Just did this on my 85'. It can be done with the air box in place but not sure with your turbo what all will be in the way.
left side take off the 2 bolts holding the bracket for the impluse sensors, remove the fuel connectors from both ends of the rail, remove the 2 bolts holding the rail, in my case I removed the injectors wires just by firmly tugging them off the injectors I then removed the metal clips holding the rail to the injectors and pulled up on the rail. Some times the injectors came with the rail sometimes they stayed in the intake. Just wiggle a bit while pulling straight out and they should come right out. You might vacuum aroung the base of the injectors first to remove any dirt so it doesn't fall into the intake. You will also need to remove the retainer loop that holds the main harness wire.
Repeat on the right only no need for the retainer clip.
If like mine the front uses a 15mm on the pressure regulator and 19 on the rail the rear uses a 17 on the hose and a 19 on the rail.

I used compressed air and blew through into the input of the injector to test for leaks. None of mine leaked at the injector but they were leaking around the shaft. There is a thread I have going on now about replacment injectors. I have not been able to find a direct replacement for the bosch others have said they have. With the turbo maybe you want a bit more than the stock injectors.