Adding speakers

i asked this awhile ago but never really got an answer. right now ive got four 4" Bostons all around in my car. i want to upgrade the fronts from 4" to 6.5" and add some tweeters on the dash. The problem is that I have no idea how this will have to be hooked up. I have an Alpine 4ch T113 Amp for my mids/highs. also, how can i run 6 speakers off a 4ch amp?

You can wire 6 speakers to a 4 ch amp if you wire two of the left side speakers in parallel or series and two of the right parallel or series. The other two just plug into there coresponding channels.