Hi, i'm helping Henne with the car. The 160L are the maximum netto volume (internal box volume). But the Ports and Woofers also need much space. I think 130L + ports and woofer is realistic. You think the Q isn't the best woofer for him? How much power do the BT need to play very loud? And the Q? The Box will be built at a local dealer in Germany. So it will be massive and good. Greetz