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A friend got a used 2006 GTI MT with a BOV. Is there any reason a BOV would be put in this car and have nothing else done to it? I'm not familiar with the GTI but I am thinking the car's ECU was modded(or the equivalent) and a new BOV was installed to accommodate the extra boost.

Thoughts? What is the best way to determine the mods on this car?

It was bought from a VW dealership and is still under warranty.

Any info is much appreciated.
 

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Authorized VW dealership policies around me have a pretty strict policy to reflash the ECU. So its possible that it did have one but is now running the stock settings.
 
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