I like the sound of the stock system, but from wahat 2 shops have told me, my amp is going bad. I dont want to change the stock system because I work in LA and as far as I am concerned its "Radio Theft Central". Now my system has that alternator humming sound and several stereo shops now have told me it is the stock amp going bad. Will it be ok if I just rewire the stock unit without the amp? How much loudness will I loose of I do this? Where is the amp? Lastly, if I should get an aftermarket one for my stock speakers and stock cd/cassette/radio what is the best route-amps, volts, channels, etc. Thanks