My galant stock amp died and I went to several places including the dealer and they said its just cheaper to get a new radio and bypass the stock amp (because the radios have amps built in). I already bought the radio as well as the METRA Double DIN Radio Installation Kit. I need to know what else is needed, like wiring for the bypassing. Also, do I need another amp, or will the radio's amp be enough. I dont need the radio to be extremely loud, I just want to have music in my car again.