I am planning on replacing my factory Bose system w/ an in-dash dvd and speakers, and I have a few questions. First, are 2way or 3way speakers better for bass-type music(rap, etc...). Second, are their any aftermarket tweeters that can replace and fit where the stock ones are, or can I use the stock tweeters? Last, what size is the rear sub speaker in the back window, and does it need to be replaced? Thanks for any help you can give me!