I would like to keep the current radio in my car. I was thinking about adding some good quality sound to my car as well as some good bass. I dont need my car to shake but I do want some "bump". I was thinking I could get an amp and replace the 2 door speakers and the 2 rear deck speakers. If i can get enough bass and good sound out of those speakers i might pass on getting a sub. But could you give me a price for what i would be paying to do this all?