BassHead91

I recently Had 2 12" P3's on a RF T1000BD and it was pretty loud and i liked the sound. I was planning on upgrading. I have a 2000 cadillac Seville and my trunk is pretty big. I like really loud bass, and spl Should I Either Get... 2 15 L7's In this prefab box... http://www.hifisoundconnection.com/Shop/Control/Product/fp/vpid/5849021/vpcsid/8189144/SFV/30046 or 2 12 HDC3 in a custom box. both of a 2000 watt-ish amp that i havent looked for yet. which would be louder?