The scoop is only the byproduct of needing the extra height to clear engine .The rad is 3500 square cm compared to 1638 normal Defender, the transmission tunnel 200x500mm
cross section .There is a vent where the snorkel used to be and the engine has two 82 degree thermostats Never seen more than 80deg in any conditions so dont think a couple of lights worry it[bigwhistle]
Top 200mm screened off for more heat[bigwhistle]

