Title: Free upgrade to S-OEM4, perfect!
Product review: Bought this little gadget to connect a Pioneer head unit to my factory Bose sound system in a w210 Mercedes E-class 1998. Got a free upgrade to a newer version (PAC S-OEM4). Installation was fairly easy (I was done in 15 minutes), and it works like a dream, no more popping, crackling or hissing sounds from the speakers. I'm fully satisfied!
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