NO air in the engine bay is always hot, whatever shielding you do !
use a V6 intake iso the airbox and use a K&N replacement filter
Not completely true! How do I know , because I measured the underbonnet air temperature.
Before the Alfa I had an E28 528i.
There was various discussions about cold air intakes, filters etc on the mye28 forum.
The air intake on the BM was right beside and above the exhaust manifold on the straight 6, by covering (with zinc plated steel) this I reduced the IR directed at the intake pipe., this was noticeable just by touch.
I then replaced the standard airbox and filter with a 70 mm angled tube and a metal mesh filter and measured the temp at the intake, it was cooler when moving but at low speed and when stopped the temp rose very quickly.
I then further "boxed off" the filter from the engine as when moving slowly the viscous fan blew hot air in the direction of intake. Boxing it made the temp rise slower when stationary and moving slowly, however when moving at speed the intake temp was more or less the external air temp.
So was there any benefit , it looked good but did nothing for performance or indeed intake sound.
I wouldnt do it again unless it was only for show.
Would I consider it in my 156 v6 , no - possibly an "performance" airfilter but only then if it was proven to give an improvement through the range and not just at 6500 rpm!
If I could work out how to get the airbox easily out I'd measure the intake temp on the v6 as well!