The RENNtech SEC V12 Widebody SLEDGEHAMMER



One of Twelve—Limited Production I Arriving in 2027

Presenting the ultimate evolution of the C126 SEC platform. This special limited series will be a homage to the legendary Mercedes-Benz M120 V12 engine found in the highly collectible CLK GTR and Pagani Zonda. The engine will be upgraded with the highest grade of components including hand-built equal length headers delivering a signature V12 sound.



M120 V12
The First 7.5 liter SEC in the World
660 HP 7.5 liter V12

M120 V12 is one of the most legendary engines in Mercedes-Benz history—an all-aluminum, naturally aspirated masterpiece that powered icons from the Le Mans-winning CLK GTR to the Pagani Zonda. Originally developed for endurance and motorsport durability, the M120 became synonymous with high-revving smoothness, bulletproof reliability, and unmistakable character. Its racing pedigree and exotic applications cemented its status as one of the great V12s of the modern era. In the SEC Widebody, RENNtech brings the M120 back to life—reengineered to 7.5 liters and 660 horsepower—preserving its soul while elevating its performance to a new peak.



7.5-LITER 660 HP V12

The M120 V12 in the SEC Widebody is the only naturally aspirated version of its kind in active production today. Hand-built by RENNtech, the 7.5L engine delivers 660 HP and 650 LB-FT of torque, retaining the character of the original while surpassing it in output and refinement. It’s a rare mechanical achievement—modernized, reliable, and built entirely in-house to deliver uncompromised performance with timeless soul.

LIMITED SERIES

Limited to just 12 vehicles worldwide, the SEC V12 Widebody is a modern coachbuilt performance car – engineered from the ground up by RENNtech. Every example features a unified chassis, drivetrain, and aerodynamic package, while the interior is tailored to each owner. Built with a singular focus on performance, precision, and individuality, it represents a rare fusion of engineering and craftsmanship.

DESIGN

The C126 Widebody is a reengineered evolution of the classic SEC, designed by RENNtech to enhance aerodynamics, cooling, and high-speed stability. Built during a full frame-up restoration, its widened stance and integrated ducting are functional by design—not cosmetic. Custom-forged wheels and flared arches complete a look that’s both purposeful and unmistakably original.