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ECU tuning is great, it gives the end user the chance to custom the engine to their needs a bit more... say you bought this car and wanted to keep it looking stock with only a few air-flow mods- lighter/ less restrictive exhaust, headers, performance intake, and maybe a port and polish. Program these mods into the ECU along with maps removing some eco settings, and boom- your engine runs much more efficiently with the added hardware, and you get the proper amount of power out of the parts. Say a more advanced guy gets a port + polish, multi-angle valve job, and a supercharger kit on top of those other mods (injectors, FPR + rail, fuel pump, ARP studs, cometic gasket, etc.) At this point, tuning the ECU (or replacing it) is really not an option. you can tune in all of your standard mods, while changing the maps for much different fuel flow and air flow... it gets more complex as you go, but from a basic stand point- with say an intake, you are tuning that in, but also tuning out some of the factory's eco settings.
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