i have no idea about where the speakers are in the 9g or how many it would depend on what package ur car had
but i do suggest instead of paying someone else to do it do it urslef and learn about or have a friend with the knowledge help you bc with audio there will allways be bugs u will have to work out u will constantly be adjusting possibly blowing speakers ground wires will loosen, etc., with puting a system in ur car its way better to get the knowledge it will save you money as well
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