i dont understand the first question, what did the FAQ thread not explain? do you have a harmon kardon system? if not than you should only have 8 speakers, 2 on the back deck, 2 on the drives door, 2 on the passenger door. and two down in the kick pannel area
kick panel= 5.25" -kick pannels
door= 1" tweeter -one one each door
door= 3.5" -one each door.
rear deck= 4"- one on left one on right.
as for changing with what you have, your gonna be doing some customizing.
as for question #2, i dont think you can, you should just get some decent side skirts.
btw-im moving to audio forum%