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If that's a CAS enclosure, it wouldn't be $100 - and it's MDF versus fiberglass. Still might sound OK, though. I always wondered if it would sound better with a grille?
Here's what I made for my '08 (~$35 + a few hours of my time):
I know the enclosure is bolted to the car, but I'm wondering how the MDF part is fastened to the metal mounting plate. I don't see any screws in the plate, and especially with a driver mounted inside, that box could get fairly heavy. I hope it's not glued together.