G-Power is often considered one of the best BMW tuners in the game. But every so often, it takes a detour and works on models from Bavaria’s biggest rival, Mercedes-Benz. 

Back in September 2015, the tuner presented a program for the 2015 S63 AMGthat put 695 horsepower and 737 pound-feet of torque into the sedan’s 5.5-liter bi-turbo V-8 engine. That’s notable because it only took a few months for G-Power to go back to the S-Class catalog and build another program for Mercedes’ flagship family.