The box is ported due to the sound proofing of the car. Surprisingly not much rattling at all. Tight and clean bass. 10" is perfect, i was on the fence with 2 12" subs. There has been a few occasions where the gas lid has popped open if the volume is up and and it's hitting hard.
2014 BMW M6 Gran Coupe F06/M Performance Black Grille/20% Tint/ Exec Package/ Driver Assist Plus/ Black on Black
Sold-BMW 550i F10/Dinan S3/ Eisenmann Race Exhaust/ Vossen CV3s