check out
http://www.reaudio.com. the problem is, their website isnt exactly updated for the new line of subs right now. what youll see on that site if the old XXXs.. youll have to call them to get ahold of them. there are a couple of threads on this site that have installs involving these new woofers. do a search for xxx and check out the top 15 or so threads, it should be easy to tell which ones have install pictures.
as of now, the 12s are the only size available, as the others are still in development (so i would assume). but they are very high power handling, very loud, very good sounding woofers, and if you can fit two of them properly, i doubt he will have them cranked much, for his ears sake.
you will need over 2000 watts for each, and because of this, youll also need a high output alternator. FYI, if this is what you plan to do, plan on about 2500-3000ted in the "substage" alone (after subs, amps, alternator, maybe battery)
then youll have another 1000 for a sweet flip out screen, and another 1000 or so for fronts & amps, eqs, etc.
this is a perry bass-heavy system though, and if you think hes gonna be more into sound quality than skirt-blowing bass, then you can spend less on subs, and more on the frontstage.
dont worry much abour the rear speakers.
