They are 2 Roadmaster RTS3200 6-1/2” woofers. I believe they are only 300 watts. Will it still be necessary to buy an amp?

Thanks. Do you have any recomendations for a cheap amp?

I found a set of subs in a custom box outside. I picked them up and want to install them in my 04 Vibe with Moon and Tunes package with the stock head unit. Do I have to buy an amp or can it work with the m&T amp? What would be the easiest place to wire it into.