This is a custom made plastic HiFi Vector Aero port box enclosure for B2 Audio mini 2" RC Car subwoofer.
We designed this enclosure specifically for the B2 Audio mini 2" subwoofer to optimize the output and sound quality using the subs TS parameters and professional design software. This box will make this sub hit the lows the best it possibly can and give you the best overall sound quality possible from the it.
 
This box was designed by us just  the same way we design large car audio sub boxes, so It is a REAL and functioning enclosure with a properly tuned Aero port and dimensions.
 
We added hole sto mount hte sub and screws are included as well.