I owna 2004 cts v and would like to improve the audio specifically bass response. Any suggestions?

Thank you

if you want bass then throw sum subs in the trunk

Hello and welcome ooffereins...

Do you mind cutting the car to get the bass - or would you rather lose trunk space to a box enclosure?

Makes a difference... And are you going to run it in competitions (looking for 140+ dBs), or just want a little thump in the seat?;)