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):

CLS 400 BiTurbo (C218 - M276 Biturbo 4-MATIC Engine) Stock Performance:

Cutting of the OEM exhaust is required

This highly integrated pre-preg carbon fiber spoiler compliments the sophisticated and refined C-Class exterior design language

6 GT3 (HP: 415 | Year: 06 > 11)

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.