because the enclosure is sealed into the opening of the trunk it's classified as a no-wall. and the extra batterys wouldnt be alowed in street either. and considering the amp he's using, the extra battery's will get the most out of it.
Originally posted by n8skow:
Where's the NW build?
in street you can only make a gasketing ring and push the box up to it which isnt as effective and street battery rules would also restrict the output of that amp so id say this install would be atleast 2db louder than the equivalent street build.