cpl (guy) has a sealed dyno cell to make sure every run he does is getting the same temp air ,so if he had the doors
wide open it would not be the same temp so the results would be different
she rang up my mate who owns a garage saying it was his son and going right off in one at him for 2days ,his son is only 4 he told her but she would no listen ,think she has gave up ringing him now