can get under seat subs, there good for what they are, as for speakers depends on your budget, i got some hertz in the RS for shows, paid £100 with comps , they are amped as well, problem with the scoob doors is there isnt much sound deadening as standard due to them been built for rallying, so some good 150w+ speakers should do for the doors, the biggest kick comes from changing the rears for 12cm items i think ? mine are 300w and give a right kick due to the size of the boot.