i have a 2004 toyota tundra. the sound system isn't bad but it definately isn't good. My friends all have kickass stereo systems and they are always showing tehm off so i want to get a kick ass system too. The regular speakers are in the door so thats not a problem but i dont know were to put a sub or subs. I have the extended cab(the one with doors that open both ways, like one and ahalf doors). Im always driving people around so I don't want to sacrafice the back seat. What are my options for a subwoofer if I dont want to loose space????