Thread: Cobb accessport
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      01-26-2013, 07:41 PM   #5
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Drives: e91 328i, e90 328i, e90 335i
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Dealers know when your car has been tuned. It stores shadow codes that log every time the ECU is flashed so it isn't hard for them to figure out that you are removing a tune every time you take it in. That said, most dealers don't care and just want the warranty work.
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