ok this is the second post of yours i just saw, the engine in the 07 is from what i know the same as the 06.. so anything from the 06 will / should work just fine. do a little searching for intakes here and you will be amazed at what you find. same thing with the audio, theres a "in car electronics" section here where you will find anything you ever wanted to know about the cars system and adding an aftermarket one to it.
btw, welcome to the club

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agreed...i just saw the HID post...usually other forums online for other models or cars are a freaking mess..we like to keep things organized here...makes for less work when you actually do a search. try it...the :search: button is your friend.
so i think that with the 6 disc you got the Bose system, not sure how the 07's are working yet, but i'm more than sure you have a sub which you can tap into that, and run the amp/sub combo you got. Its a "pinned" or "stickied" section in the In Car Electronic section.
also about the HID's...i'll tell you to do a whole complete retro with E46 projectors, w/ hella ballasts, and philips 4300k bulbs, or you can just get another plain old Xtec kit from the group buy section on here, without swaping out the projectors...but thats up to you..like we said, search and you will find.
oh yeah welcome to mazda6club! :drive: