My car is non Bose sounds, I have a mate who has the Bose and the difference I am finding is massive. Standard? I presume so. So I wanna upgrade the rear section (the side speakers sub n amp) but want all sizes that fit into standard positions. So does anyone know what the actual rear speakers are, like size and if 2-3way? Also what size is the sub, can I get same physical sized sub n amp but obv with twice the power? Anyone with experience of this can recommend specific speakers would be real handy, thanks.