I want to replace my stock non bose sub. I did a quick chat with crutchfield and came up with this. I want to reuse the stock local at least and maybe reuse the stock box. He said the Polk Audio db840 would fit in the stock box and I could reuse the stock amp (whats the amp rated at?) I dont mind doing a little upgrade but im NOT AN AUDIO guy at all. I blew my stock sub and want one to put back in there but a nice upgrade