I get what everyone is saying about the subs, however I think it also depends on the condition of your stock 6x9s. Mine were **** when I replaced them with Kenwoods, so I noticed a big difference (not saying that I actually was getting sub tones though.) If your's are in good condition then you probably won't notice much of a difference between the two after installing the new head unit. By the way, I have the kdc-bt945u, and I love it! it is practically the same head unit, just a bit older. But I have to say, I didnt think I wanted a sub when I upgraded all of my components, and I am definitely wanting one now... That will be a project for a different day. Thinking of fabbing a fiberglass box to mold into the far front of the trunk so you could actually open up the pass through and see the sub.
