I've seen mixed responses in random threads. So, I did a search for "weather tune" in titles and each thread only had one or two responses. I'm trying to understand what different ambient humidity and temperature levels would affect tune wise? You're just sucking in cooler air during the winter right? Not more volume... just cooler air. What's the need for a separate tune? What would be different in a cold weather tune as opposed to a warm weather tune? Timing? I just figured the mass air would adjust accordingly. :shrug: