make it loud

hey everyone

whats the best way to give my car that loud bass thumping? I want it to be loud and noticable, but not obnoxious. I dont need anything to extravagant, and since Im a student with a limited income (ha ha), Im not looking to shell out loads of money. I know nothing about stereos and boxes and such, so any websites or anything would be helpful


thanks a bunch

Rachael