Anyone know a decent car audio place that will do a professional job upgrading the system in my new Tiguan? In Sydney?

Looking to add an amplifier and possibly upgrade the speakers. It’s an MY17 which I love sooooo much but the sound isn’t great. (Is there already a sub woofer or do I need to add one too?)

Any advice at all would help I can’t find much on here except for the Dynaudio upgrade which we can’t get here...or it’s about $2500?