hi guys, my mate asked me to come over to his farm today to have a little bit of a race. its the first time the car has been revved quite high for a long time or possible its first time lol, after a while there was smoke coming from the bonnet so i opened up and it was coming from the radiator, the car was still driving fine and the temperature was as normal. i wouldnt say i was really pushing it, i didnt go over 5,500 rpm. could this be a sign of hgf, any help would be appreciated thanks