Wow I looked into it and the soundqubed looks to be exactly what I'm looking for! Thanks so much! I measured the space I'd like to work with in the back of the trunk it's about 38" wide, 14" tall and 28" deep (So a 15 is out but maybe 2 12s, although I'd prefer one big sub). Another option is to put a 15" over one side of the back seat (which is totally too small for a person to sit anyway) those dimensions are 19" wide, 22" deep, 31" high. Any advice greatly appreciated! Would it be best to stick with the amp that comes with the package?