6 I think
2 tweeters, 2 door, 2 rear
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I would only replace the front speakers :>
fyi...I'm recruiting help on this question :)
CDA-117ri(European) faceplate w/North American(CDA-117) head unit - DIYMA.com - Scientific Car Audio - Truth in Sound Quality
pioneer avh-5200bt is what you want. single din and pumps out the tunes. has bluetooth and a USB port for your flash drive. all touch screen. had it for 6 months and even got the navigation upgrade!