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I have upgraded all speakers (base), and added an under seat sub. There appears to be a difference of opinion, of whether a rear speaker flash is required to open full functionality of the rear speakers, or if a Forscan change will fix it. There is definitely a difference with the rear speakers. Out of the four dealerships in my area, only one is aware of the rear speaker flash, and it is $130. For any that have had it done, is the juice worth the squeeze?
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