RENNtech RENNtech SEC V12 Widebody SLEDGEHAMMER

[Jonathan19]

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.

 

[Swissbob]

THIS is what HWA should’ve done instead of the 190.

 

[Matski]

THIS is what HWA should’ve done instead of the 190.

The 190 has proper motorsport pedigree, the SEC does not, it was a much more logical choice given HWA's origins.

 

[Jonathan19]

I can't wait to see this project! They've already made some superb creations.

To view this content we will need your consent to set third party cookies.
For more detailed information, see our cookies page.

Accept third party cookies

To view this content we will need your consent to set third party cookies.
For more detailed information, see our cookies page.

Accept third party cookies

 

[martinbo]

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.

Pretty sick, I must say. Nostalgia is a weird thing.

 

[Centurion]

The side profile is sweet.

Go for it Rentech. Singer sell restomods for $2m. There are plenty of deep pocketed baby boomers who are happy to buy nostalgia/memory for happy butterfly feelings in their tummy.

 

[KiwiRob]

The side profile is sweet.

Go for it Rentech. Singer sell restomods for $2m. There are plenty of deep pocketed baby boomers who are happy to buy nostalgia/memory for happy butterfly feelings in their tummy.

The baby boomers are dying off, the oldest are early 80's. It's their kids who are buying these cars with their inheritances.

 

[Revvd]

The 190 has proper motorsport pedigree, the SEC does not, it was a much more logical choice given HWA's origins.

I agree, but don't let this ↓ guy hear that. He'd be upset

 

[Matski]

He'd be upset

Indeed, upset enough to eat it's own gearbox and DNF (with it's sister car having similar issues)

 

[Rolf]

Wow this is going to be a very interesting car to lust after. Love the widebody and adaptation of the V12 in a C126 body. With some modern underpinnings it will be a nice car to drive. Cant wait to see some pics of the interior.

 

[Merc1]

I like this much better than the 190E project by the other folks. This has the potential to be a true lust object.

M

 

[Jonathan19]

“RENNtech’s journey began where the pre-merger era left off” says Hartmut Feyhl, founder of RENNtech. “The SEC Sledgehammer V12 is not a tribute - it is a continuation. It represents what these cars were always capable of, had the limits of their time not existed”. Introducing the RENNtech SEC Sledgehammer V12, an ultra-limited commission of just twelve vehicles worldwide, representing the ultimate evolution of the C126 SEC platform. Developed and built entirely in house, the SEC Sledgehammer V12 merges Hartmut’s pre-merger heritage with RENNtech’s state-of-the-art engineering, continuing a lineage rooted in the golden era of bespoke Mercedes-Benz performance. At the heart of the SEC Sledgehammer V12 lies a 7.5 liter naturally aspirated V12, based on the legendary M120 architecture. The engine is comprehensively reengineered with forged internals, CNC-ported cylinder heads, advanced intake and exhaust systems, equal length headers, and bespoke calibration. Output is rated at 650 horsepower and 650 lb-ft of torque, delivered through a 7-speed manual transaxle. Chassis development includes RENNtech adjustable coil over suspension, reinforced control arms, carbon ceramic braking systems, while bespoke forged 19-inch wheels complete the widebody stance. The result is a vehicle engineered to modern performance standards while preserving the mechanical character and presence that defined the era.

 

[Swissbob]

I think the manual doesn’t fit, I’d rather prefer the 9G-MCT TBH.

 

[KiwiRob]

The one I'm waiting for is the Mechatronik Project 107 SLC

 

[SNB]

“RENNtech’s journey began where the pre-merger era left off” says Hartmut Feyhl, founder of RENNtech. “The SEC Sledgehammer V12 is not a tribute - it is a continuation. It represents what these cars were always capable of, had the limits of their time not existed”. Introducing the RENNtech SEC Sledgehammer V12, an ultra-limited commission of just twelve vehicles worldwide, representing the ultimate evolution of the C126 SEC platform. Developed and built entirely in house, the SEC Sledgehammer V12 merges Hartmut’s pre-merger heritage with RENNtech’s state-of-the-art engineering, continuing a lineage rooted in the golden era of bespoke Mercedes-Benz performance. At the heart of the SEC Sledgehammer V12 lies a 7.5 liter naturally aspirated V12, based on the legendary M120 architecture. The engine is comprehensively reengineered with forged internals, CNC-ported cylinder heads, advanced intake and exhaust systems, equal length headers, and bespoke calibration. Output is rated at 650 horsepower and 650 lb-ft of torque, delivered through a 7-speed manual transaxle. Chassis development includes RENNtech adjustable coil over suspension, reinforced control arms, carbon ceramic braking systems, while bespoke forged 19-inch wheels complete the widebody stance. The result is a vehicle engineered to modern performance standards while preserving the mechanical character and presence that defined the era.

The red one. Pure fantasy and ecstasy! But I’d like mine in ‘80s ‘pure’ white.. perhaps called Colombian White

 

[SNB]

The one I'm waiting for is the Mechatronik Project 107 SLC

I thought it has been abandoned, been teased for a long time.