Replying to Looking to upgrade my sound system

So my system in my 2000 Subaru Impreza kinda sucks...nooo bass at all. So i'm looking to replace the speakers. my question is, can i buy some good speakers that will give me some good bass? or do i need a sub woofer? obviously a woofer will give me a crazy bass, i'm not looking for that. i just want my system to sound like ones in most cars today. my previous car was a 97 nissan maxima and it had a sick system with really good bass...was there a sub woofer without me knowing about it or was all of that bass just coming from the speakers?