usually woofers with built in amps would suck....its still best to seperate them...

what kinda car do u drive that u have problems with space? what do u have in ur car right now dude?

a bass tube is a good idea actually. itll take up abit of space in ur boot. but dont lie it down. stand it up. i would suggest 10" woofer. i would also suggest a 10" woofer in a box. will take up even less space in the boot... and u can actually put ur cargo on it.

or u could get a custom enclosure to make it fit under ur front seat like u want. meaning the woofer will be facing up instead of side. can be done. ive seen those kinda enclosures before. worst comes to worst...go for 8" woofers.

i suggest going to an installer and tell him what u want. he might be able to help u out with something. if ur in PJ. go to CV Audio in uptown. talk to the boss named peter. hell be more than happy to help u with ur options.

but be warned. ur gonna have to be firm with ur budget. the feller really knows how to racun one. up to today i still havent figured out a way to slip by his racuns...hehhehehehhehehe