Yes you will have to run wires up to the deck and battery to hook up the amp. You'll probably also want to have new speaker wire installed as part of it. Overall cost shouldn't be that much if you get it done. Also, the "200 watts" your head unit is rated at is a measurement of its absoluter peak ability. Imagine running the thing completely wide open while testing it's output. At the very second before it goes chernobyl on you it's developing 200 watts. It's RMS (or average) power rating is probably close to 10-15 watts/channel. This coupled with the tiny little capaciters and transformer used virtually guarantee sub-standard sound. It's not all about copious amounts of power. It's about clean power being delivered correctly to your speakers.