Here in the Dallas area my temp needle never goes past the half way point. And it has been 100 deg already. I have the stock radiator, with an intercooler, and oil cooler in front of that, Plus I run my A/C, and I never have overheated or run hot. I am not positve, but I think its the stock radiator. I did find that the car had a Webber big mouth 60mm TB, and a Centerforce clutch when I bought it in its non turbo form about 2 years ago. Its also a 78 280z