I have a 93 g20. I'm trying to install a 200 watt Alpine cd player in it. When I went to circuit city, they said my car probably has a factory installed amp and it cost $80 more to bypass this amp. I would like to know if my car has the amp, can any tell me? Also does anyone know where it is, and why they can't just install the cd player and hook it up to the amp? Any info would be helpful.