I had a PWR raditor in you BAII Turbo which worked great cooled the car down really quick. An Intercooler will make a different, cooler inlet temps means more power and better cooling eff. When I had my standard intercooler on warm days I would get two or three hard runs then it would back off and the engine temp would go up. I played with a custom bonnet with skyline style vents in the bonnet, was good sitting at the lights all the heat came out but on the move it had a neg effect and didn't allow the hot air to get out. Go for the oil cooler and do something with the sump, it will make a big difference and keep you car from going bang. I just brought a FG turbo, just getting some pedders coilovers in, some rims and some brembo's. I'll hit the track then. Darwin is hot but we get about 3-4 laps so that should look after the car somewhat.