I think you just want to get louder..why dont you save yourself some money and just build a larger enclosure with some good bracing n resin the indide and do some sound deadening to the trunk and cabin. Maybe some deadener and then sound barrier on top of it. Mdf isnt too expensive and sound deadener will only set you back a few hundred if you take advantage of a sale promotion. Better than sepending 1200 just for a new amp. Also whenever your batteries die on you think about getting all same brand and same group size batteries..different batteries of different group size and brand cycling charge between them can cut down on battery life for all of them. Just tryna help out