RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980s! Our experience, countless hours of in-house research, development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability.

RENNtech tuning software for Mercedes offers significant gains in horsepower and torque across the vehicles entire power band. By modifying ignition timing and throttle mapping, optimizing air-to-fuel ratios, increasing the engine's rev limiter and modifying boost mapping for turbo-charged vehicles, RENNtech performance software unleashes the true potential of your Mercedes.

With the proprietary RENNtech ECU Tuning the W205 - C 63 AMG gains up to +66 HP and +107 LB-FT, based on power numbers measured by RENNtech. Please note that the Mercedes M177 engine performance when measured, obtains higher numbers than rated from factory. The maximum power number reached with the RENNtech ECU Upgrade fot the W205 - C 63 AMG is 601 HP and 657 LB-FT.

Note:

• Mercedes M177 engine performance when measured, obtains higher numbers than rated from factory.
• Power gains are calculated with stock numbers measured by RENNtech 

C 63 AMG S (W205 | M177 | 4.0L V8 BiTurbo) Stock Performance:

• Rated by Mercedes-Benz:        503 HP @ 5,500-6,250 rpm; 516 LB-FT @ 1,750-4,500 rpm
• Rated by RENNtech:                 545 HP @ 6,150 RPM; 550 LB-FT @ 3,700-4,700 RPM
• Mercedes M177 engine performance when measured, obtains higher power numbers than rated from factory.

C 63 AMG S (W205 | M177 | 4.0L V8 BiTurbo) Modified Performance:

• 601 HP @ 5,650 RPM; 657 LB-FT @ 4,250-4,800 RPM

**VIN NOTE** RENNtech often requires your vehicle's VIN number to process orders. Please leave this information in a note during checkout or email us with your order number after order is placed*

RENNtech has become the premier Mercedes-Benz specialist and Hartmut Feyhl himself is regarded by many as USA’s foremost authority in Mercedes tuning. His vast experience comes from 12 years spent at AMG Germany before serving as the North American division’s Technical Director. Prior to the tuning company’s merger with Mercedes-Benz in 1999, by the request of AMG Germany, Feyhl branched out on his own to start RENNtech and service the existing AMG North America customers.

Performance without compromise. This is the foundation upon which we have built our reputation. Established in 1989 by Hartmut Feyhl, RENNtech has evolved and grown from servicing AMG’s customers into the foremost authority on tuning and customizing AMGs and Mercedes-Benz. RENNtech also offers tuning solutions for Porsche, Audi and Bentley vehicles, along with other European luxury cars.

Over the years, we have developed high-performance products for virtually all Mercedes-Benz AMG vehicles. Some of the most notable among these are the 200 mph RENNtech E7.4RS (which claimed ‘Fastest Sedan in the World’ honors by Car and Driver Magazine in 1996) and the more recent 945 LB-FT 5.5L V8 Biturbo RENNtech R3+ Monster. Each of these vehicles are just a sampling of what RENNtech has achieved, featuring extreme performance, upgraded aesthetics and a fit and finish that rivals factory vehicles.

We design, engineer and manufacture our proprietary line of tuning products in-house at our facility which features a full fabrication and machine shop with CNC and rapid prototyping capabilities; in-house performance dynos, complete engine management and software tuning capabilities along with a complete service/repair/installation facility and a full-time design, engineering and sales staff.

Our headquarter facility is located just north of the Palm Beaches in Stuart, Florida