I have a 2012 ford focus I just want to know if I can hook up subs with the stock radio?

Will I be able to hook up subwoofers to a 2012 ford focus stock radio?

Hi so you could blow and destroy the amplifiers inside the car radio as it is not designed to handle such hight power devices.

You can, but 15-20 watts stock won't make it do much. Fine, if you like it, but 20 watts to a tweeter can be as loud in its range as 60-90 watts to the woofer. Of course more power than that to the bass will emphasize it more. Make it sound realistic.