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Liestune Engine Control Unit (ECU) Tunes are developed utilize state of technology to bring you the highest caliber inherently EPA, CARB, and TUV compliant ECU Tunes on the market. Leistune does not alter any sectors of the ECU tune that could alter emissions in any capacity. NO! We will not shut off your CEL if you removed your catalytic converters, or removed any emissions equipment.
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