dont know how much power you plan on running or how much cash you plan on spending but I would do 1-12. Those cars are contoured very nicely for bass response. I have heard 1-12 in an Iroc and it was insanely loud with about 500 watts. so tell me your budget and what you need exactly and I will try to hook you up.
Man you got a good car for bass, get 2 12's that can handle 500+ watts RMS and a good amp and that will pound rediculous, my buddy had 2 MTX Thunder 8000 12's and a 1501D MTX amp and it beat very very loud, not too pricey either, i dunno just a suggestion
I got two eclipse aluminum 12's for 420 bucks with shipping off www.woofersetc.com, great subs they pound in my volvo haha, you can get a good priced amp off the website too. All their subs are cheap and have 1 year warrantys.
I have a camaro and i run 1 sub, and its bangin.. I run all fosgate equipment. I have 1 T1 sub..at 600 rms 1200 peak and it beats, i had a guy at a car show think i had 4 12's. Depending on what sub you get, you dont really have much airspace for 2 12's, i would stick with one. Unless you want 2!
I have a camaro and i dont think a 15 will work unless you have a custom box built. Right now i have 2 10 inch kicker L7s and they dont sound too bad. I would recommend 2 12s in a sealed box built for camaros. Some people will tell you to face the subs right at the back glass but it will sound better and be louder if you just spend the extra money on the right box. plus im not really sure what my subs would do if they were faced right at the glass b/c they shake the whole hatch lid and make the window move as it is.
I went to my sytem guy, and asked him what you should run, and about that 15" sub. And he said the 15" isnt a good idea...because of mounting it and stuff, like Kenny said. People here may not like Rockford Fosgate, but you can find a T1 sub for about $250 and its WELL worth it..my car is pounding...... ( i have a camaro also) I recommend RF...but hey, its what ever floats your boat!!!
I was thinking about going with 1 12' X X X or a Brahma... What do you guys think?
The X X X or the brahma would be a much better choice than JL audio. But since the subs are fairly visible in a camaro i would go with 2 subs unless you have your back window tinted out and you dont plan on showing your system off at all. But thats basically looks, but whatever sub/subs you decide to get make sure they work well in a small sealed enclosure b/c thats all i have ever seen anybody run in a camaro, im sure you could do somethin else but it would probably be difficult and cashy.
I would not do a brahma unless you can get your hands on a older mark II version. The X.X.X will sound very good with the propper amp but I have a feeling you will exceed your $800 budget. I would look into Ascendant Audio or Image Dynamics. 1-IDmax 12 in a vented enclosure tuned to about 28-32htz will knock the pants off of any 12 Rockford Fosgate could throw at it. That would be first then maybe 2-Atlas' from ascendant audio you would actually be under your budget on that and they are very nice, I have an avalanche but I have heard great great things from the Atlas, they use the XBL technology that REXXX and Adire use and for $140 each you cant go wrong at all.
James i was thinking about 2-Atlas as you said and that for sure will put me under my budget. But wont a single X X X have more SLP and SQL then 2-Atlas? If i had room i would get a avalanche but thats not going happen. What amp will push X X X?