temp sensor is part #17 on the parts diagram here:
http://c782366.r66.cf2.rackcdn.com/107-10.gif
perhaps the air filter heat soaks - lots of opportunity to heat the air as it passes through the filter.
I read on another forum where a guy put ram air side vents on his boxster (you know, scoopy vents). from what I could calculate you need to be going 150 mph or so before you get the benefit of 'ram air' - forward velocity forcing air into the intake faster than the engine can suck it in - so I thought they were useless. what he noted, however, was that the ram air intake cooled the intake air charge considerably. I guess the reduced diameter of the of the intake caused a venturi and cooling effect. so, what is of more benefit - less work to draw the air in given larger diameter intake, or forcing the engine to accelerate/decelerate the air to cool the intake charge with a constriction in the intake?