I've done tests with a pod filter and partition with the stock air duct feeding into the partitioned space. I'll post results like Robo's did:
1) the temps stablise at 60+ even in heavy traffic (not 100)
2) pod does get warmer by 5deg when you slow down a bit. but cools down again, as long as your over 60km/h
3) POD's temperature rises straight away at the traffic lights by a massive 25deg. on idle for 3 minutes, not 5deg. it took 7 minutes of driving at 70km/h to lose the heat soak.
5) travelling on the freeway with 2 quick bursts in 3rd, saw the pod drop by 3deg., not rise 5deg. Driving on full boost saw the pod actually drop in temp.
I think the important test is plenum and intercooler temps (actual intake temps), not pod temp.
This was done on stock boost, stock intercooler, 3" turbo back exhaust. (R33)
-rb25