hey everyone im new here.. im looking to get either 2 12inch fi btl subwoofers, or one 15inch fi btl subwoofer.. im going to have to fabricate a box for my car, i have a 97 lexus sc400 , i currently done the big 3 , have 4gauge wirers running to the trunk where i have a alpine mdf 1000 amp powering a mtx 5500 tripple sledge hammer box. the bass from that dosent do it for me, so im wondering what you guys would think is better or my car i listen to rap hiphop music, i read that my trunk capacity is 9 cubic feet,