questions

i just bought a nissan nx 2000 with the sr20de motor now i want to know how much boost i can run with a t25 with the stock det exhaust manifold stock det injectors with the det computer will it run lean hom much boost is safe do i have to do anything else with the fuel so it dosnt lean out also where can i put the oil return line. are the stock det injectors all i need for good fuel
thanks kenny