Renntech has a new upgrade for the Mercedes-AMG GT63 4-Door Coupe. It’s called the RIIX (arr-three-ex), and it combines the aftermarket specialist’s highest power upgrade with a functional exterior aerodynamic package.
The under-the-hood of the Mercedes, the upgrades take the twin-turbocharged 4.0-liter M177 V8 engine to 1,196 horsepower and 927 pound-feet of torque, which is a lot more than the stock 681 hp and 736 lb-ft of twist from the model. The package includes all-new Stage II high-performance turbochargers, a re-mapped ECU, a carbon-fiber air intake system, high-pressure fuel pumps, and other tweaks.
