Well I've been reading on here for a month or so and I figured I should just join to get some opinions. Right now I have two rockford fosgate 12 inch t1's on a rf t10001bd in a prefab ported box. Well I'm going to be putting them in a different vehicle plus I've been wanting to get louder anyways. I was wanting to do two rf t1 15's but I figured I should ask on here and see what I can get that would be louder than those. I listen to pretty much rap and I'm wanting that loud low deep bass so probably like 75% spl and 25% sq. Whatever I get will be going in the trunk of a 98 dodge avenger and I plan on having a rf t20001bd to power whatever I get. I'm thinking either 1 18" or 2 15's if you think I could fit them. I'd appreciate any help, thanks.