Amps are only on vehicles with "premium sound" (premium my ass). If your doorpanels say "premium sound" on the speaker grilles, then you have it. If not, look behind the glovebox anyway. If you already have cassette with premium sound, what you could do, depending on your car, is add the dealer installed CD player w/o radio in the 2nd slot (pre-98) or install the dealer installed trunk-mounted 6-CD changer (98+) but since you already have your radio...nevermind...
