The best way to lower underhood temps is to take advantage of the existing aerodynamics of the VX rather than modifying for at best poor performance. The rear section of the hood produces a significant low-pressure area which would be well suited to an extraction-type vent. This provides a way to move an increased amount of air through the engine bay which would translate to decreased temps. This increase in airflow would also benefit intake flow as well, although marginally. Providing shielding against radiant heat on the airbox and ducting coupled with the airflow increase should net some consistent gains. As mentioned in earlier posts, you simply won't get anything significant until you go to forced induction.

When N1 was working on the CF hood insert there was to be a prototype with an Evo-style extraction vent. Since he became ill it may be some time before that happens if at all. In the meantime I've been working on a way to incorporate that mod in an existing insert and will share the info once tested.