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I´ve seen these and they are definately worth the cost. Just to reset your error codes once at the dealer will cost you almost as much as this tool and you can do it whenever you want. Plus some allow you to record your runs so you can see how your mods are affecting your performance. I need to get one for my A6, I´d like to be able to monitor the engine a little more than the onboard gagues and computer allow.
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