Hi, I just bought a 2000 4Runner SR5 about 2 weeks ago. My question is about the stock stereo. I have the 6 speaker system with CD and cassette. I have a 60watt x 4 Panasonic CD player that I want to use with the stock speakers. How much power does the stock system have? Does it use any amplifiers? If I install my head unti and leave everything else stock, will there be a big difference in sound? Thanks for any advice you have.