Two files appeared.

At its core, an ECU tuning file is a modified version of the manufacturer’s stock software. Factory calibrations are intentionally conservative, designed to accommodate varying fuel qualities, extreme climates, and negligent maintenance schedules while adhering to strict emissions standards. Tuning involves altering parameters within this software—such as increasing turbo boost, advancing ignition timing, and adjusting air-fuel ratios (AFR)—to extract more power. Traditionally, this service is rendered by professional tuners who use a dynamometer to datalog and customize the software for a specific vehicle. A "database" of tuning files, by contrast, operates on a different premise: mass distribution.