Depends man, i lucked out with my car because its been VERY reliable as it was always taken care of. But most you see are thrashed out and have problems which is why im boosting mine to avoid buying someone elses lemon. Also my mates are mechanics and my whole setup is costing me ~$1500 ish to do, 7psi base tune on 98 at first then some big injectors and E85 after. They make about 250rwkw on stock turbos(16psi) and PULP98, i'm hoping mine on 18psi and E85 will be a little bit more than that. R33 is allround easier to work on and live with, but after driving many examples of both i can't go past a nice Z32.