Hey everyone, I'm new here, great site and I look forward to be apart of this forum!!! I have a 2003 325 cic and have a qestion about the stereo sytem. I dont have the harmon kardon, and i regret not getting it. my qestion is how can i upgrade the system? will simply putting in better speakers make a difference while using my existing head unit? are there any aftermarket speakers that fit in the existing stock locations? should I buy harmon kardon speakers? I'm not one to blast the speakers, i just want soemthing that sounds clear when im on the highway with the top down. Thanx for the info!!!