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2003 Chevy Impala Power Programmers & Performance Tuners

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Reviewed By thomas p (whitehouse station, NJ) Reviewed for a 2003 Chevy Impala —11/22/2013 2:30 PM

My car runs the premium fuel programing with no knock on regular pump slight ping at part throttle 89 octane cures it all.Definitely more responsive, drivability improves, shift firmness better removes speed limiter as well mileage is harder to judge, it did not get worse I just haven't had a real chance to check precisely if you drive the car in the torque curve where it improves the engine performance it isbound to improve

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