You need a head unit with sub pre outs or it'll be a pita if you have the mach system. With the stock head unit it is a major pain to get everything to work together, its also a pain sometimes with an aftermarket head unit. As far as the 10" subs go, I had 2 very good ones, and thought it sounded great, then I tried a single 12" on the same amp... that 12 blows away the 2 10" setup, hits much harder, infinitely clearer, more response... pretty much better in every way... best advice I could give you is go with a good single 12" setup, you'll love it, with everything else, I can do 100mph with the windows down and hear the music clear and no wind. I can probably get you the specs for my enclosure as well.
__________________ That hunk of junk? Yeah, well I've made a few special modifications to that yellow 99 Gt, it makes the Kessel run in 12 parsecs and eats turbo japs and poops chevy's | 
1997 Mustang Sound System 
