Unless you have some major work done to the motor, a chip won't do you much good.
Also, I think it's worth noting what the company says on their website.....
Quote:
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Originally Posted by 20hosepower.com
The fuel/oxygen ratio must remain between 13:1 and 17:1 to remain efficient 
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How would you like to have these guys Dyno-Tunning your car?
"Hey Larry, your a/f ratio is 16.5:1, it's still a little rich."