knight179 Report post Posted June 23, 2009 I have a ford fusion Hybrid with the 502A package. i installed a sub/amp and left the sony speakers that came with the car. i wanted to know if i change the speakers and add a new amp for the speakers, will i noticable difference without adding a new head unit? im using the the factory head unit (dont think its possible to change it anyway with the navigation package. if there is please tell me). Thanks Quote Share this post Link to post Share on other sites