DC Level 3's are rated for 600 rms and pound. Just go to YouTube and search for "Gibbs Level 3 12" and watch. Probably more than what you are looking for.
I love my '04 GTP!! 1st gear is a lil slow, but after that it'll give you want you want and more. Plenty of room in the trunk, back seat is a little cramped.....I'd recommend it.
I know you do bro. Trust me, I will be recommending your services to the few friends of mine who are looking to get something done in the next few months. Your box game is on point!!