I would replace all vacuum pipes with 4-6mm internal diameter silicone tubing and secure each end to where the connect to with small cable ties. Replace any suspect hose, especially leaky/cracked oil pipes because this will cause problems to the engine/turbo if they break! As has been mentioned already, get rid of the shady t-section, replace with a length of silicon tubing from the carb base to the AEI unit (do the cup mod perhaps?). Check all main boost pipes (from turbo to intercooler, intercooler to carb) for splits, loose jubilee clips etc... Check the carb top for leaks as well, this should be securely fixed to the top of the carb. Check the rod on the actuator to the turbo is still attached as well.
P.S. Can you take a decent high res pic of your engine bay from a few angles to show the whole setup? Then we can zoom in on things of particular interest.