UPDATE: So I have replaced the timing belt system, and the tapping isnt gone, but something i believe i forgot to mention, last time i checked the oil filter there appeared to be some silicone bits stuck to it, i believe the previous owner did some shady repairing with silicone and it ended up in the engine, so we went and checked the oil pump, which seems to be clogged, weird, because the oil pressure test was fine, now im going back and replacing the oil pump and the piston rod bearings.
Also, genuine question, since my turbo is pretty much done for, would a bigger turbo be an easy upgrade, or am i gonna have to replace injectors and so on?