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Welcome to ECU_Tuning, the subreddit geared towards those with an interest in the science of tuning.
If you're interested in the basics of tuning, check out High Performance Academy's free course to get a feel for what exactly goes in to a tune and some things you'll have to consider when tuning.
To see which software/hardware you need to tune your ride check out the applications page of our wiki
r/megasquirt for all things related to the megasquirt standalone
r/CarHacking for CANBUS and related information
r/EngineBuilding for the mechanical side of engines
r/CarModification for all non-tuning mods
For a brief list of software packages, what their applications are, costs, and other info check out our Wiki