I just adjusted my order after I upgraded my power from 1200rms to 1800, so I added level 4 soft parts. I figured I would get more sound out of this then over powering the 3s to much and under powering the 4s. What advantages did this spur of the moment choice get me? Is this set up going to change the T/S so much that I will need a new box? Is this going to function better in the ported box built to level 3 specs? 3.7 before displacment tuned to the mid 30s. My space is limited so going any larger is a challange, running of a Kicker 06ZX1500.1. 1/0 OFC big 3, yellow top, 1/0 in CCA to the back. I will be changing to 1/0 OFC and adding a small battery before they get here.