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I also have the superchips tuner on my 05 w/m6. First, it is virtually idiot proof. Really plug and play. Second, the car does indeed seem to run smoother with more crispness to my application of the throttle. I have no documented proof of improved performance as I have not had the car very long and have no track experience with it. As for fuel mileage improvement, again I have no documented proof of an increase. Once again because of my limited time with the car. Now that spring has sprung I will get more seat time and be able to see if the mileage has improved. Right now I am obtaining about 18 mpg on my rural road drive to and from work.
I realize this may not help much, but I would do it again in an instant. I did get mine used so I was able to get a good price on it.
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