RENNtech ECU Hand Held Tuner | HHT | R230 | SL55 AMG Kompressor | 528HP/552LB-FT | 5.5L Kompressor | M113 | MY2003-2008 porsche-cayenne--92a---2011-2018--gts-esr8899844 Mercedes 400 | M276 |

Mercedes 400 | M276 | 3

Rated by Mercedes-Benz:      515 HP @ 6

Rated by Mercedes-Benz:      577 HP @ 5

a few minor inconsistencies and differences between parts are possible

TCU Upgrade: TCU upgrade elivers faster acceleration by matching the power output of our ECU and Turbo upgrades with increased Clutch Torque Limits

RENNtech ECU Hand Held Tuner | HHT | R230 | SL55 AMG Kompressor | 528HP/552LB-FT | 5.5L Kompressor | M113 | MY2003-2008 porsche-cayenne--92a---2011-2018--gts-esr8899844 Mercedes 400 | M276 |RENNtech ECU HHT (HandHeldTuner) for the 230 SL55 AMG Kompressor. Up to 528HP and 552LB FT. Gains: +35HP & +35TQ. 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.