its just a turbo but depending on the year will detrime the difficulty of hooking it up. Like an 84 perfict fit but I think they are both t3's but the angle on the wheels might be diffent the 280zx is 60 degrees. Now if its a 94 I really don't know how well it will fit. But to much PSI and you'll run lean or detonate. to solve the problem of lean if its a first gen 300zx get a 84-85 turbo ecu. Remember a turbo is a turbo there's no electronics. Just be carful if its a new one not to over boost it. Well actually you can't get over 6psi stock because of the pop off valve; and you can't run over 9 psi with out an intercooler. So you might want to ask and see what cmf's the 300zx and 280zx turbos will produce and the psi you want.