Go to www.sounddomain.com and look around, I would recommend sealed boxes but that's just cause I'm particial to cleaner bass. I would also suggest you stay away from bandpass boxes.
GO with ported or sealed the w3s dont perform that well in bandpass i dont think i have two in a ported box that jl makes they make the best boxes but you could find some goodones on the net too also i have a 96 eclipse and they rae basically the same car so you can get a huge box back there.