One 12W7 in the HO box fits perfect in our trunks and they look and sound very sexy. Down fall is the 700 bucks it costs lol. But I promise it will sound 100% better and louder than your 2 15's. But if that costs too much Image Dynamics is a very good sub too. One of the setups in my Honda was an IDQ12 with PPI art series amps and I scored very high in stock SQ.