Guys, this is a well known issue with the donor cars (Spitfire / GT6) The issue is not getting air into the radiator, but getting the hot air out of the engine bay. In most conditions, this is not a problem, but in high speed running it does cause problems. That's why the Le Mans Spitfires had extra bonnet vents behind the front wheels, and the GT6 has extra louvres on top of the bonnet.
Towed, with your large scoop pushing extra air into the engine bay behind the radiator, it is not surprising that you have reduced airflow through the matrix...
Extra radiators and pumps will not help in this case
Baz from Brusels
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