Right now the car has nothing for a sound system. Ive got new 3.5's on the way, new 6 1/2s bought also. I have a 15" L7 in a 4.25 cubed box tuned to like 32hz. Its sub up, port back. Ran in a RF t1500bdcp amp tuned with a multimeter. I can say i really honestly wasnt impressed with it as much as i had hoped. It got loud without any problem, but it didnt feel like it got low or hit hard like a 15 on 1k+ should. If i can get this thing sold im looking to spend about $225 - $250 for a 12 or pair of 10's. The thing is i need to stay smaller on the box size, 4 cubes aint going to cut it as i need trunk space. The sub MUST be able to take 1000-1500 RMS. must THRIVE in 3 cubes or less ported or sealed. What do you all recommend as about $275 is the max im getting on local offers.