Hypertech aren't recommended by everyone, this thread on the Trackscotland forum tells of power runs being done with bonnets closed and only a small fan.
It just seems to depend on who you want to believe, from what I have read on the internet Subaru folk recommend Hypertech, Evos recommend Wallace Performance, Fords recommend Ava, etc
But that is just what I have read, best to speak to the RR operator themselves and make your own mind up.