honestly imo, forget the pioneers and get memphis m3's. They would better suit your application than mojo's. they sound great in a ported box and get extremely loud. On your current amp all you would need is one and with your new amp you could run 2. They are rated at 400 rms a piece but my friend is running two 15's off the memphis 4000 watt amp with a 260 amp alt in his escalade in a very effiecient ported box and the numbers he puts up on the tl are insane (i dont remember the numbers so dont ask but i remember they were in the 150's at the least- i'll ask him soon).