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691 HP 694 LB-FT W222 - AMG S 63 ECU Upgrade
93 Octane or higher gasoline has to be used with R1 upgraded RENNtech vehicles to avoid damage to the engine and reach the claimed power levels
The lip spoiler features two highly integral stanchions which serve as both the connection to the upper wing element and the location of adjustable carbon fiber struts
Larger impeller (inlet)
With the release of the Vantage V8
RENNtech Intermediate ECU Upgrade | C253 | GLC63 AMG (S) 4MATIC+ Coupe | 574 HP/612LB-FT | 4.0L V8 BiTurbo | M177 | MY2016-2022 hsm 691 HP 694 LB-FT W222Intermediate ECU Upgrade GLC 63 AMG S and non S Up to 574 HP 612 LB FT Gains: +48 HP & +80 LB FT RENNtech tuning products are certified to meet CARB standards in all 50 States. 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
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