Jetta TDI 2009, Do the chips help
Jetta TDI 2009, Do the chips help with horsepower increases and improved gas mileage, if so which one is good or the best.
The counter points I have heard prev, was if you could improve gas mileage by 5 mpg, for $200-400, would VW, do this themselves.
Are there any risk with using chip, ie blowing you engine
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