skar subwoofers

I am fixing to run (2) Skar VXF 12's, 1 ohm in a ported enclosure. I am currently running (2) Skar SDR 12's, in the loaded enclosure on a Pioneer GMDX 971, roughly 1,200 rms. The SDR's sound great, but I believe the VXF's will be better. I currently have the Mechman 240 amp alternator, and 1 XS...