Hey,
I have two Kicker Comp VR 12's in my truck, it is an extended cab Nissasn. I hit a 143.2 with those two 12's in a ported box, with 4 cu feet of air space. Those 12's were pushed by a crossfire 1000d (1000 watts rms) (2000 watts peak) I also had a one farad battery capicator. To help keep the power flowing.
Here's the deal, most people dont hit the same db number show after show, many condtions have to do with sound pressure level. It is hard to tell you what that system would to becuase it all depends on box design and the amp you have to push the system ect.
My advice is to buy the speakers, build a box that matches the called for airspace. Find an amp that will push (RMS) power to each of the speakers. Finally make sure that the ohm of the speakers are comptible to the amp you want to use. Finally make sure you know how to wire the speakers to the amp, without over-loading the amp.
Good luck and let me know how this comes out!
oops, I missed the part where you bought the audiobahn subs! They are great also! Good choice
Chris