June 7, 2023

RENNtech Unveils the 1196 HP Limited Edition Mercedes-AMG GT63 4-Door Coupe RIIIx .


RIIIx : The Most Powerful RENNtech Upgrade Ever1196 HP | 871 LB-FT

We are proud to announce the launch of our latest creation based on the Mercedes-AMG GT 63 RIIIx. With superior power and advanced performance tuning, the limited edition RIIIx is set to claim its place at the top among street-legal 4-door vehicles in the world.

The RIIIx is powered by the Mercedes-AMG twin-scroll M177 BiTurbo V8, producing equipped with RENNtech’s Stage II high-performance turbochargers that feature larger inducer and exducer wheels along with a special core assembly featuring reinforced axial bearings for less rolling resistance and zero lag.

To ensure the engine receives the necessary air flow and fuel supply, the GT63 RIIIx is fitted with an integrated carbon fiber air intake system with a 30% larger filter surface, and high-pressure fuel pumps. The exhaust system features RENNtech stainless-steel high-performance downpipes with free-flow 200 cell catalytic converters and upgraded performance mufflers produced specifically for the AMG GT63.

Thanks to RENNtech’s Transmission Control Unit (TCU) and Powertrain (CPC) upgrades, the RIIIx boasts lightning-fast acceleration, achieving 0-60 mph in 2.44 seconds and 0-100 mph in 5.5 seconds and a quarter-mile time under 10 seconds, the RIIIx was built to blow the all the doors off the competition.

Through an extensive series of tests on the Dynamometer, RENNtech Engineering revised ECU mapping for injection, ignition, and boost pressure control  as well as real-world test drives on the road and at the track. 

The peak output of 1196 HP and 927 LB-FT of torque is produced at 6,200 rpm on 100 octane fuel, and 964 HP and 846 LB-FT of torque on 93 octane fuel. The driver can easily switch between octane ratings using the Hand-Held Tuner, offering the option for maximum power and convenience for daily driving.

The RIIIx’s exterior carbon fiber aero package includes functional styling elements to produce more downforce for improved handling and stability at high speeds and the aesthetics of the GT63. These highly refined aero components were designed by RENNtech and are constructed in the USA using aerospace-grade pre-preg carbon fiber. 

With the record braking power figures, RENNtech Engineering has once again demonstrated its commitment to innovation, performance, and design. For a lucky few, the RIIIx is an exceptional vehicle that combines Mercedes-AMG cutting-edge technology and engineering with unparalleled power, making it one of the fastest four-door vehicles on the market.


  • 1196 HP & 927 LB-FT (100 Oct.)
  • 965 HP & 817 LB-FT (93 Oct.)
  • Carbon Fiber Air Boxes
  • Stage II Turbo Upgrade
  • Downpipes with 200 Cell Catalytic Converters
  • Stainless Steel Performance Mufflers
  • ECU Programming
  • Transmission Control Unit programming
  • Powertrain Control Unit programming
  • High Pressure Fuel system
  • Blow Off Valves
  • Hand Held Suspension Module
  • Exhaust Valve Module
  • Heat Exchanger


  • Carbon Fiber Front Splitter and Canards
  • Carbon Fiber Side Skirts
  • Carbon Fiber Rear Diffuser
  • Carbon Fiber Adjustable Rear Wing with Fixed Base
  • RENNtech RIIIX badging


  • RENNtech RPS 10.2 Forged Aluminum Monoblock wheels
  • Front: 21 x 10.0”
  • Rear: 22 x 12.0”
  • Michelin Pilot Sport 4 S
  • Front: 275/35 ZR 21
  • Rear: 335/25 ZR 22

Carbon Fiber Side Skirts and Forged RPS 10.2 Wheels

Carbon Fiber Rear Wing with Fixed Base

Carbon Fiber Front Splitter with Canards

Carbon Fiber Rear Diffuser