So the best option is the actual ECU reflash, you’ll need to buy a Tactrix Openport 2. Also, as fun as power is, horsepower doesnt make for fast lap times alone. Get some practice with a wrench and learn some physics behind the engine first. Avoid anything turbo or supercharger related in the beginning. There’s also piggyback systems like the AEM FIC, however you will have to cut up your car’s wiring harness and cause destruction and it still isn’t as good as a real reflash but then you can tell the ECU to do exactly what you want to do, disable catalytic converters codes, pass E-Checks with illegal exhaust systems, etc Smart-Tune ECU Controller simply installs to the the IAT /MAF and Exhaust Gas Oxygen / Exhaust Gas Temperature sensor of your Mitsubishi Eclipse Cross and modifies the Intake Air Temperature and O2S/EGO/EGT sensor signal, so definitely you can expect a more efficient condition from the horsepower of your Car, truck, SUV. has a good list of the basic mods you can buy for these cars. Of course there’s also standalone engine management systems but that’s out of the realm of what most people are trying to accomplish unless you’re building a track only track monster or you watch too much Street Outlaws lol ![]() However that’s all in the past for anything 1997 and newer for the most part, what everyone does now is what is called an ECU Reflash, this allows you to connect a computer or handheld tuner to a car’s OBD2 port and put the ECU into a reprogramming mode and literally overwrite or read off the definition file containing the maps and tuning information from the car’s computer ![]() Only time those plug and play “performance chips” were actually doing anything was in the early days of computerized cars and fuel injection when people were taking apart the ECU and quite literally removing the programming chip and replacing it with a performance chip that had different maps programmed into it, talking about some 80’s and 90’s cars probably American ones like Mustangs, etc. Yup CMTurner is right, those plug and play tuners are all smoke and mirrors they don’t do anything at all it’s all rubbish.
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