RENNtech

+91 HP and +132 LB-FT is exactly the summer upgrade your C217 S63 AMG needs. ☀️

The RENNtech R1 Performance Package takes your Mercedes-AMG S63 Coupe to up to 696 HP and 801 LB-FT at the crank, unlocking serious power from the 5.5L V8 BiTurbo without sacrificing daily-driver comfort or reliability.

R1 Package Includes:
✅ RENNtech ECU Upgrade
✅ 3rd Gen Diverter Valve
✅ High-Flow Air Filters

With improved boost control, faster turbo response, and reduced turbo lag, the R1 Package delivers huge gains across the entire RPM range — making your S63 AMG sharper, stronger, and ready for summer.

Ready to wake up your C217 S63? This is where it starts.

The RENNtech Power Module ECU Upgrade for the Mercedes-AMG S63 E Performance W223 takes the M177 4.0L BiTurbo V8 with Electric Drive to an impressive 890 HP and 1,062 LB-FT of torque.

Engineered to enhance power delivery across the entire rev range, the RPM fine-tunes ignition timing, throttle response, and air-to-fuel ratios for sharper acceleration, stronger mid-range pull, and a more commanding drive.

Housed in a precision CNC-machined 6061 aluminum case, the module features pre-labeled wiring and connectors for a clean installation. A supplied bypass plug allows the vehicle to be returned to stock quickly, with the harness fully removable when needed.

Unlock more power from your Mercedes-AMG with the RENNtech ECU HHT (Hand Held Tuner) for the C209 CLK 63 AMG Black Series.
Engineered for serious performance, the RENNtech HHT delivers up to 534 HP and 485 LB-FT of torque, with gains of +34 HP and +20 LB-FT — all without removing your ECU.
The RENNtech HHT plugs directly into your OBD2 port, allowing you to switch between stock and tuned ECU programming anytime. Flash your vehicle in just minutes and reflash as often as you like.
With optimized ignition timing, throttle mapping, air/fuel ratios, rev limiter settings, and performance calibration, RENNtech ECU software helps unlock the true potential of your Mercedes-Benz AMG while maintaining daily-driver reliability.

For a limited time, save 10% on electronic modules like the RENNtech HHT through 05/31.

Upgrade your CLK 63 AMG Black Series with proven RENNtech performance.