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Message: <blockquote data-quote="RockstarMentality" data-source="post: 954337" data-attributes="member: 11894">I bough my car with an SCT Livewire already installed. Well I was messing with it today and I flashed an ECU that was already present in the tuner. After all that was done, here's what I noticed:1. An increase in top end power (like 3k-5k)2. A slightly different sound to my car. Not deeper or louder, just different idk how else to describe it3. After engaging the clutch, RPMs climb down a LOT slower than normal. This made shifting a breeze4. Very slight if any increase in low end torqueSo I guess my question is what's happening to my ECU to make these changes in the way my car drives? What should I expect in terms of fuel economy after "flashing"? How much of an increase in power should I see from this? Note: It was a while ago that I bought the car, but I vaguely recall the PO telling me he had it tuned down for MPGs. Only mods are Intake/Exhaust</blockquote>