I have the stock single CD radio (RBK?) in my 03 2500 and would like to get a bit more volume and better bass / treble or better yet an EQ while retaining the stock look, feel and connection harness of a Dodge unit. I was considering swapping it out for one of the better models from a 2003 or newer truck if I can find one in nice shape or NOS. Can I keep the stock speakers and is it worth trying to do this? If so what model would work best (RAZ, etc. )? If I have to rip out all the speakers and add an additional amp to make a better Dodge unit work properly, I'll probable leave everything as is or go completely aftermarket. Thanks far any info.