Is there any type of PCI card that i can connect to my home audio system so that all my MP3s will play thru my home system

All audio cards can be connected to any audio system. Mine is connected to Hi-Fi. All you need is cable and jack connectors to connect line-out (or audio-out for headphones, if the line-out isn't available) from your audio card and connect to the line-in on your audio system.
Line-out is preferred, since it broadcasts pre-amp signal, unlike audio out.

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