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Hi, I have a 2003 bmw 530i preminum sound system its def not HK, also have navi, what size and brand of speakers do I need to use for perfect fit into my stock speakers moderate price would be good, Im not looking to spend a alot maybe 100-200. and will this make my system sound better ? by changing the front 2 speakers or should i change all stock speakers ? if I have to change all stock speakers how many are there ?