I haven't got my car yet, but have been reading up and dreaming of the mods I want to do. I love the extra noise you get from an induction kit, but having tried various induction kits on my MX5, I gave up because of the loss of low down grunt. The heat soak of the alloy pipe and the hot air being drawn in, really murdered the engine and it was especially noticeable during the summer months, not to mention the extra fuel I was using, and in the end I went over to a supercharger.
One of the things that MX5 owners do, is to use a decent panel filter and drill the airbox. That way they got the sound and not as much heat. What do you guys normally do to combat the problem?