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Discussion Starter · #1 ·
I was at my independent VW shop getting a couple VAG-COM tweaks done, when my technician saw something he had never noticed before. There is an emission setting for "Euro spec 5." I asked what that means, and he said it would appear that by simply checking that box, it would downgrade the ECU programming to the previous specification.

Does anyone know if this is true? Theoretically, it would allow the engine to breathe a little better and maybe get a little better mileage? Any danger to giving it a try to see what happens? Maybe drive around awhile with him and his laptop in the passenger seat so he can monitor whats going on in the engine?
 
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