Complete divorce. It's all a resistor you put on your mass airflow sensor that tricks the car into thinking its cold is putting out a little more power. Low fuel consumption. A complete and complete snake oil scam. Although they were pretty cool with returns. And they even added a $10 shipping fee to my order. You might want to go online on YouTube and learn a little about 2-wire tuners. It is impossible to properly match the two wires connected to your MAF sensor.
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