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or catalytic converters, which mess up the O2 sensor readings the tuner relies on. The Verdict

: Storing multiple tunes (e.g., performance, valet, or anti-theft) and switching between them using steering wheel buttons. Uprev Cracked

Many professional tuners offer "e-tunes" where they send you a licensed cable and a custom map tailored to your specific car and mods. or catalytic converters, which mess up the O2