Bandpass boxes work best for trucks since they have to be much bigger. Nearly twice the size of a sealed sub enclosure.

Second, I own Alpine type-R speakers while my friend has Pioneers. And lets just say mine sound a hell of a lot better.

And the specs on paper on paper are usually right. I doubt a speaker company would lie about the volume of their speakers. They will however, run their tests with cars at 14V and at beautiful temperatures and atmospheric pressures. Of course the specs given by manufacturers are ideal, not lies. You just have to know how they find their numbers.