RENNtech ECU Upgrade | SL 65 AMG | R231 | 735HP/836LB-FT | 6.0L BiTurbo V12 | M279 porsche-macan---my2019---gts-esr8103631 GLS 450 BiTurbo (X166 -

GLS 450 BiTurbo (X166 - M276 Biturbo 4-MATIC Engine) Modified Performance:

Our proprietary ECU upgrade for the Mercedes M133 engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability

5L V8 BiTurbo) Modified Performance (at crank):

light weight

in addition to perfect fitment to the factory rocker panels and lower rear fascia

RENNtech ECU Upgrade | SL 65 AMG | R231 | 735HP/836LB-FT | 6.0L BiTurbo V12 | M279 porsche-macan---my2019---gts-esr8103631 GLS 450 BiTurbo (X166 -RENNtech ECU Upgrade for 231 SL 65 AMG. Up to 735HP and 836LB FT. Gains: +114HP & +100LB 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. Programming takes only a