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Controlling when and how much fuel enters the combustion chamber.
He never charged for tuning files. He charged for his time, his labor, his honesty. But the maps themselves? Those stayed free.
If you are serious about tuning but have a low budget, invest in a cheap MPPS cable (approx. $20-$40 on AliExpress/Amazon) and join Digital Kaos or MHH Auto . Spend time reading the "Guides & Tutorials" sections there; they are far more valuable than the files themselves.