well i got the bandpass box foir the new 2005 model alpine type r its 1.20 cubic feet so it looks like its going to work out pretty well my other question is do i need to turn the amp down now like does it need less watts than the sealed box?
If its overpowering your front stage turn the gains down a bit and yes a bandpass box's biggest advantage is usualy in the efficiency department. It should be a lot louder than a sealed enclosure, but if its not designed specifically for those subs it could very well sound awful.
Oh as far as sounding loud from a distance a large sealed enclosure might produce better results as they generally have better low end extension, but why? If you want others to hear you coming down the road mount that bandpass on your roof.
Depends how the bandpass box was structured. My friend made a bandpass box for his Fosgates. Before this kid down the street sold him a Road Gear bandpass box. He loved the way it sounded in the road gear box but I thought the box was poorly structured and told him I think he would defintely be more sastified with a better structured box. Had air leaking between the corners of the box. I told him to use a box calc. to for precise dimensions. So he did and made the box very neat and sealed except for the bandpass vents. Talking about a difference, compared to the road gear box heis box made it sound like he added another sub it the setup.