RENNtech ECU Hand Held Tuner | HHT | S 63 AMG | W221 | 534HP/485 LB-FT | 6.3L N/A | M156 | MY2008-2010 mercedes-benz-a-class--177---2019-present--a-35-amg-esr2974641 0L Inline-4 Turbo) Modified Performance

0L Inline-4 Turbo) Modified Performance (at crank):

The V3 VAG DLM module requires no splicing or soldering

The software also has three locations where the user can store pre-configured suspension setups for quick changes

Our intermediate ECU tune increases performance from 556 HP and 550 lb/ft torque up to 624 HP and 680 lb/ft at the crank

RENNtech ECU Hand Held Tuner | HHT | S 63 AMG | W221 | 534HP/485 LB-FT | 6.3L N/A | M156 | MY2008-2010 mercedes-benz-a-class--177---2019-present--a-35-amg-esr2974641 0L Inline-4 Turbo) Modified PerformanceRENNtech ECU HHT (HandHeldTuner) for the 221 S 63 AMG. Up to 534HP and 485LB FT LB FT. Gains: +16HP & +20 LB 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.