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Originally Posted by thatryan
Anyone have an idea why the factory amp would have to be present?
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I have a bimmtech amp installed and the dealer had no issues doing the retrofit. I did lose some of my coding but not all..
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Best,
Charlie
2013 328i MSport Estoril Blue, 6spd MT, Premium, Tech & Drivers Assist +, Bavsound Stage One/Ghost, Bimmertech Amp