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I've noticed there are performance chips for sale for 2001 impalas and I wanted to know if anyone has any advice on those, what they would increase in the engine. ie: fuel, air ratio or what?? I know alot of chips are complete bull.
 

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Now is it an actual CPU (reprogrammed/flashed) to replace or existing one? Normally this would cost a few hundred dollars. Don't be scammed by so called chips that you can get off eBay for a few bucks. These are not actually chips but resistors that trick your sensors into thinking your car is running lean and in turn would dump more fuel into your car. This is a bad mistake to install and it will greatly effect performance and MPG.
 
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