I think Kyle (Mr. 007) had misunderstood your question and thought you were referring to our RL-s drivers. In my experience, I will never recommend 1500 watts on an RL-p series driver. Sure it can be done, but that is "runnin in the red" so far as I'm concerned, and unless you are very responsible in your listening habits, you could definitely fry the RL-p if you keep that much juice on it for too long. Not to mention, it's not necessary for great performance and output, and will instead likely push the driver so far that it will produce more distortion than it would off of comparatively less power. 700 watts on the RL-p is a very happy place to be, especially in a ported enclosure. No question that two RL-p's (12's or 15's) in a ported alignment will get louder than your sealed 13kv2's - but as people have suggested, you might just want to try throwin' those kv2's into a ported box first and if you're still unsatisfied then move up to the 15's. OR, if you're satisfied with output but yearn for better clarity, you could consider the 12" RL-p's, but honestly if you're going to upgrade, do it right and run with the big boys! <{POST_SNAPBACK}> And Bib Boys you are referring to the 15"s? Now to figure out how in the hell I can fire 2 15's forward and the port in the trunk of my 05 Altima. I have a lrage openign behind the rear fold down seats and want to thave the subs facing that way. My problem is is that the height in that area is 15" so i would have to figure out an angled front baffle to put the 15's on. I am just nervous about rear firing and losing output.