i dont see how u want to make big power with a limited space it aint gonna happen :P unless u get a pro setup where the subs are mounted into the boot and yer with all the vinyl and all that sh*T. but yer u want more just get 2 12's that are decent like S TYPES or Pioneers, just the average 100 buk a sub and get a average amp. however u do it, it will take half ur boot