Having built several tire well enclosures, make it out of mdf to fit in the well area, the bass tends to stretch the well overtime and crack when you fiberglass them.

you`ll love the Lanzar subwoofer, I did a install using the Opti1232D inverted and even ported and it plays everything the customer was so happy with the range of music it plays.

Hope this helps

Heres a pic of the install