What are you looking from the subs. Are after more SQ, because most thin mount subs don't have a ton of output. The loudest thin mounts subs I have used where the Critical Mass LS122 and LS152. These things handle a ton of power and got loud doing it. Man to bad they don't make them any longer.
Now if you are looking for outstanding sounding thin sub I can get you the Alto Mobile Falstaff. Do a google search on them. These are in my top 5 for best sounding subs I have listen to.
You have a PM.