What would be better for my focus?

Question

i have a 2000 ford focus 4 door (not a hatchback)

which of these two subs would be best for me

and which are best sound quality for all types of music?

http://www.sonicelectronix.com/item_9238_Pioneer+Premier+TS-W3001D4.html

http://www.sonicelectronix.com/item_2731_MA+Audio+HK120XC.html#

Answer 1

Stick with your factory stereo equipment.

Subs will make it louder, but not improve the sound quality.

Particularly, if you end up mounting them in your trunk.