i just got a 200watt amp.....im using it till i get money to buy a nicer one....i have a stock head unit in my mustang how do i hook my wires to the head unit?

 

depending on what you have you can either do:

1. Plug stereo level inputs into the amps and run new wire to your speakers from the amp or

2. Use Line Converters (2) to change the speaker level inputs to line level inputs (pre-outs) and then run RCAs to the amp and wire to your speakers.