RENNtech ECU Hand Held Tuner | HHT | CLK 63 AMG | C209 | 517HP/485LB-FT | 6.3L N/A | M156 | MY2007-2009 audi-s8--d5---2019-2020--4-0l-v8-esr9872235 This product is designed to

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RENNtech ECU Hand Held Tuner | HHT | CLK 63 AMG | C209 | 517HP/485LB-FT | 6.3L N/A | M156 | MY2007-2009 audi-s8--d5---2019-2020--4-0l-v8-esr9872235 This product is designed toRENNtech ECU HHT (HandHeldTuner) for the 209 CLK 63 AMG. Up to 517HP and 485LB FT LB FT. Gains: +39HP & +20LB FT. RENNtech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal! Our proprietary tuning module stores both the RENNtech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to the ECU.

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