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Cheap "Tuning Box/ Power Boxes" TDI PD

Mk4 Golf 
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mk4 golf
4K views 25 replies 16 participants last post by  Richard W 
Is this for real, the boxes that are over 200ish actual chips that overide the existing ECU chip? As it all goes in to the same plug as the mod that can be done with a resistor, are they any different?
 
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