Currently upgrading my Sony 10 speaker
Audison bit one processor ( keeps stock mft but way better then any after market head unit)
Audison SR4 amp
Focal ps 165 mid/tweets in the front
That all iv done for now and its 4 times louder than stock and a wider range of sound, well worth the money in my opinion . I plan on compeating my car in a sound quality competition next month with the current set up after a bit more tuning is done with the bit one.