my car keeps on overheating ive changed thermostat i have pulled the waterpump to make sure its good changed radiator and the car keeps on overheating i thought maybe head gasket but not mixing coolant with oil car is not missing and compresion is perfect any ideas anyone?

i have even extended the dump from the external wastegate to go lower than the radiator

The SR20 is really sensitive to air in the cooling system. I'd double check to make sure the system is bled properly. Perhaps throw in a bottle of Water Wetter just to make sure? Outside of those suggestions, I'm too stupid. Good luck.

thank done that