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Originally Posted by Cynthetiq
from the way the box looks in the photos t doesn't look legit . You reprogram the most important part of the EFI just by splicing something into the system? sounds fishy already
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It's not a chip, it's a resistor. You put it inline with the Intake Air Temp sensor and it changes the reading.
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Originally Posted by LoganSnake
How much did it cost? I wouldn't mind getting that kind of an upgrade at all.
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You can't get those kind of gains with a 'chip' on a car that isn't turbocharged--to pick up 70hp and 5mpg, I'm sure it was a turbo passat, and it turned up the boost.
It isn't worth spending money to buy something to increase your fuel economy, because the only things that would really help totally blow away any potential fuel savings. Just change your driving style and carefully monitor your tire air pressure.