6.5 inch rear speakers, upgraded from 4 inch.
And the RES head unit is a tad more powerful.
Put the Pioneer 1655s in the front and add the Honda subwoofer. Sounds superb. Step 2 would be to get rid of the paper cone things in the back and put something else in. I used Pioneer 1665s, but I think they need baffles to bring out any bass. Oh, well, when I have a moment...