RENNtech ECU Hand Held Tuner | HHT | SL 63 AMG | R230 | 534HP/485LB-FT | 6.3L N/A | M156 mercedes-benz-s-class--220---1999-2006--s-600--1999-2002--esr7119407 S550 (W221 | MY2012-13 |

S550 (W221 | MY2012-13 | RWD | M278 | 4

We have found the M177 engine stock performance numbers vary from the baseline figures claimed by Mercedes-Benz

CLASS E (W 211) 350 V6 4-matic [2 Filters Required] (HP: 272 | Year: 05 > 09)

CLS (C 219) 5 AMG [2 Filters Required] (HP: 476 | Year: 04 > 06)

CLS 63 AMG (C218 | PFL MY2012-13 | RWD | M157 | 5

RENNtech ECU Hand Held Tuner | HHT | SL 63 AMG | R230 | 534HP/485LB-FT | 6.3L N/A | M156 mercedes-benz-s-class--220---1999-2006--s-600--1999-2002--esr7119407 S550 (W221 | MY2012-13 |RENNtech ECU HHT (HandHeldTuner) for the 230 SL 63 AMG. Up to 534HP and 485LB FT LB FT. Gains: +16HP & +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.