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      07-05-2019, 01:37 PM   #4
avd3k
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Drives: 2018 M3 ZCP
Join Date: Aug 2015
Location: Pacific Northwest

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Another reason why it's so expensive to retrofit options - when the car option is selected during build it's the difference in price between regular and updated components, while during retrofit you have to buy all affected components again (and then _maybe_ recoup some cost by selling old parts).