A friend of mine writes engine mapping software, and has hacked ECUs, but I have to say that there are so many constantly changing variables, that I believe that anyone changing their engine mapping is better off having it done by a highly experienced person, who is dealing directly with your vehicle's setup versus software uploads as they only account for general parameters, with typical mods—it's that serious of a business. Sure you can change many parameters yourself with a software/hardware setup, but you'd better know what you are doing.
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