2009 Scion tC

Well it depends on the setup. We've got a shop around here that has a few locations around Jacksonville called Daddy O's stereo. They usually have a package deal for about $299 or so that comes with some mediocore subwoofers, a cheap amplifier, and free installation. It's usually two 12's or two 10's.

I wish I had more motivation with car stereos, atleast even with automobiles in general as I'd love to open my own customization shop, but eh.

If you need any help with that, or with your HU let me know. I bet you can browse around google and find out about your HU if it has the plugs on the back or not, or just pop the dash apart real fast, loosen up the two screws and just look. I'm guessing since it's a '09 it's got a pre-amp, or one under the seat so the wiring in the back might look kinda weird. Who knows.