I put 4 8's in my girls car and I put the subs and ports facing to the back of the car and it was loud, but when I turned the box around so port and subs hit inside the cabin, I swear to god all her bass went bye bye. I thought it was just because I had air pockets on the side of the box but then I covered it with pillows and towels and it still didn't improve. All I can really say is that some cars work and some don,t and a 2000 Civic Sedan does not work, its best to have it hitting towards the back for her car.