I need a custom box for cheap for my bmw X,3. i have 2 8" pyles and one 12’ i Want deep bass sound but keep trunk space car .
This isn’t really a place to find car stereo speaker and such.
This is your better option.
Not so fast! Place the speaker box in your trunk but leave the grill in the back on but remove the speakers. What u will find is that u must move the air to move the bass . Depending how u “port” those holes will determine the size and sound of your bass