Thanks guys. I'm worried about large stones hitting the radiator at speed. As it is after only 3000miles my radiator "fins" are beginning to look battle scarred. I think i am going to make the assumption that since the Cup cars have the grill and they appear to have basically similar cooling and (front) aerodynamic design as the road Gt3 (airflow through bonnet vent) that it should be ok. Will keep you posted on any cooling problems or whether the front end feels as planted at high speed.