So I just had one of my buddys install a sub and amp. I decided to not change the head unit out right away as I didn't want to spend 11tybillion dollars right away. Will changing the head unit make that much of a difference? or am i good keeping the one I have. Probally going to have to change it to get better sound The head unit right now is the pioneer one they put in cobalts. ibyoudriveacobalt ibradionewbie Cliffs: had sub installed, is getting a new head unit going to make a difference?