Good info-Thanks mate!
Short story: No it's not really functional, and yes it was a custom job. We bought a new 2017 VDJ bonnet from Toyota and had the scoop cut out / grafted and cold bonded onto our 105 bonnet. The shop had never done one on a 100 series before so they were keen to get one under their belt and we were happy to be a test subject since we were only paying for parts and materials, no labour.
Not so short story - we were originally planning an LSA swap into our 105 and had the bonnet done in anticipation, but the engine turned out to be junk so after bit of a battle we got our money back and ended up with 416ci stroked L92, and the plan was to sell the scooped bonnet. In summer we found the intake temps at idle were getting up to ~60ºC / 140ºF so we tried a vented bonnet but there was no real improvement, and it didn't look too good either. So the scooped bonnet went back on and instead we spent some time sealing up the shroud and placing some baffles around the radiator intake to prevent hot-engine-bay air from recirculating in through the radiator when the car is stopped - problem solved! Well, it's an LS and things still a bit warm in and around the engine bay but we never see those high intake temps anymore.
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Now I'm kind of interested to see the engine swap and what baffling you added around the radiator to stop engine bay heat recirculating to radiator.
And the pic's of your trip are phenomenal- wide open spaces- sand dunes- ocean - no one else around. Dont know much about the Southern area of WA, but sure looks nice.