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Performance enhancing chips. Good or bad?

Asked by Dr_C (14132points) February 16th, 2010

I was browsing e-bay and found this performance enhancing chip for my Xterra that promises to enhance horsepower and improve gas mileage up to 40 MPG. Does anyone have any experience with these things? Is this really possible? Is it a scam? Will it mess up my car? Should I do it or just move on?

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