Renntech is developing an ambitious program to modernize 12 Mercedes-Benz SEC coupes with custom-built V12 power.
Each car in the project will be built to order, with extensive upgrades throughout. Here’s what sets these reimagined SEC models apart:
Engine
At the heart of the build is a naturally aspirated 7.5-liter M120 V12—the same engine family found in the Pagani Zonda and the Mercedes-Benz CLK GTR. In this application, it produces 660 horsepower and 649 lb-ft (880 Nm) of torque.
The aluminum engine features equal-length headers and has been thoroughly reworked to deliver both performance and durability in a modern context.
Transmission
Power is sent to the wheels through a custom-built manual transmission, emphasizing driver engagement—something rarely associated with classic luxury coupes of this era.
Braking System
Stopping power comes from carbon-ceramic brakes, providing serious fade resistance and performance. The hardware sits behind forged two-piece wheels designed specifically for the project.
Aerodynamics and Stability
Each car will receive a widebody kit engineered to enhance aerodynamics, cooling efficiency, and high-speed stability. The aggressive stance is matched with functional improvements, not just visual drama.
Full Restoration
The engine upgrade will be carried out alongside a complete restoration of each vehicle, ensuring the finished product blends classic Mercedes craftsmanship with modern engineering standards.
Mercedes produced the SEC between 1979 and 1991, offering it primarily as a coupe based on the S-Class platform. Various inline-five, inline-six, and V8 engines were available during its run. However, a V12-powered SEC was never part of the original lineup.
An S-Class equipped with more than eight cylinders didn’t arrive until the third generation, known internally as the Mercedes-Benz S-Class (W140).
Industry observers say Renntech’s restomod concept is genuinely impressive. The widebody treatment alone turns heads, but pairing it with a high-output V12 makes the project truly special. Even though the youngest SEC models are now more than 30 years old, enthusiasm for these classic coupes remains strong—especially when they’re reimagined at this level.