Ok, my car is 1999 chev calalier 2 door and ordered a DC audio 18" XL M2 D1 last week. My amp got here 2 weeks ago, a crescendo BC 2000D I know I need to work with about 6 cubes but not sure on the port size or direction. also should I seal the trunk off and have sub firing forward? the trunk is small so not sure what way to go to get as loud and low as i can. please help!