RENNtech ECU Upgrade | SL 400 | R230 | 392HP/432LB-FT | 3.0L BiTurbo V6 | M276 mercedes-benz-s-class--222---2018-2020--s-560-maybach-esr2691399 The maximum power number reached

The maximum power number reached with the RENNtech ECU Upgrade for the E450 is 392 HP and 463 LB-FT

The rear spoiler integrates seamlessly into the rear of the vehicle and offers a dramatic

The central area features a low-drag

If your vehicle is equipped with factory exhaust valves

See STAGE 1  and STAGE 2 Turbo Upgrade for additional details

RENNtech ECU Upgrade | SL 400 | R230 | 392HP/432LB-FT | 3.0L BiTurbo V6 | M276 mercedes-benz-s-class--222---2018-2020--s-560-maybach-esr2691399 The maximum power number reachedRENNtech ECU Upgrade for 231 SL 400 BiTurbo 4 MATIC. Up to 392HP and 432LB FT. Gains: +63HP & +78LB FT RENNtech M276 Biturbo ECU Upgrades are TV approved! 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