Has anyone tried one of these tuning chip boxes? There seems to be quite a few different ones on ebay for around £79. Do they work and are they likely to damage the engine/ECU? I'm looking more for better MPG than MPH.
Has anyone tried one of these tuning chip boxes? There seems to be quite a few different ones on ebay for around £79. Do they work and are they likely to damage the engine/ECU? I'm looking more for better MPG than MPH.