Went to a local shop today to get a quote for some 15" cvr's and the guy was telling me about a box he can build me that the port is connected to the cabin of the car... appearantly they run the box w/ the subs facing forwards and all the air and bass comes straight into the cabin... I sat in his car (2 10" kicker cvr's on 600 watts) and it slaaaaammed, has anyone ever heard of this type of box or worked with them? They want to charge me $550 for the box... is it worth it?