DINAN Means.....?

DoubleZ

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I just bought a 2003 Z4 with DINAN aftermarket equipment. Arrowhead BMW (Glendale, AZ) tells me that BMW corporate required a car to be "detuned" to OEM specs before it can be sold by a BMW dealer. Anyone heard of this? I do know that the air box and exhaust are DINAN and there is a badge on one of the shock towers with "DINAN 5" on it. Exactly what does this mean?
 


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