Right now I run 3200 rms ( yes- I know it's way over-rated though... ) to my 15's. When I get the 18's, I'll put 4000-5000 RMS ( of good power ) to each of them. Sounds a bit crazy for a mx-6, but if ya saw mine you'd see why I wanna do it. The back seat of my car was taken out and a cage was put in. I have that whole area for subs and I figure maybe that 4 kinetik hc2400, a few amps, and all that stuff will still fit nicely in my trunk. I love the fact that all that will fit in a car that looks like mine, but it's a pain in the ass. Last month I did Carlisle and was put in extreme street cause the location of my boxes. Considering what i was up against, I did ok. But that made me want 18's. And the only thing better than two 18's is like 6 or 8 of them. I want a van... f@** that, I want 160 db...