The Mercedes C63 AMG already looks amazing and aggressive enough for most sports car fans out there, but American tuner, Renntech, have taken it a step forward. The tuner is offering a new C74 widebody conversion kit with engine boost for the sedan starting at $11,950. The full package adds bold styling, refined aerodynamics, increased downforce, and improved handling thanks to the increase in overall vehicle track width.

The exterior package boasts of carbon fiber elements consisting of a rear deck lid spoiler and a rear diffuser package featuring distinctive exhaust tips, front and rear fender flares, and wide body conversion kit. The widebody kit increases the overall vehicle rear track width to 74" and allows for the ability to run up to an 11" wide rear wheel with a 315 series tire for the ultimate in handling and traction.

The engine modifications are well worth it as the 6.2 liter V8 engine has been tuned to deliver an impressive 605 HP and 555 lb-ft from the standard 457 HP and 442 pound-feet of torque. This will give the sports sedan a 1/4-mile time of 11.4 seconds at a speed of 126 mph and a top speed of 204 mph.

Anyone would be crazy not to want to turn their Mercedes C63 AMG into this type of beast, but Renntech is offering individual options for anyone who can’t handle the look and feel of the grizzly package. Prices range from $ 3,950 (€ 2,800) for the rear diffuser and integrated exhaust tips to $ 1,650 (€ 1,180) for a simple rear spoiler.

Press release after the jump.

Press release

As the world’s foremost Mercedes-Benz/AMG tuner, RENNtech unveiled their latest project vehicle at the 2010 Festival’s of Speed in Orlando, Florida. All performance modifications and exterior aerodynamic modifications were designed, developed, and tested in house at RENNtech’s facility located in Lake Park, Florida.

The C74 is the latest variation of RENNtech’s C63 AMG project vehicle which has seen continual transformations throughout its life, serving as a working test platform for RENNtech’s proprietary line of performance products. The C74’s current trim boasts incredible performance from the 6.2L AMG V-8 with a wide stance and aggressive look to match. The "74" designation given by RENNtech, refers to the 74 inch width of the rear wheel track which lies beneath the body work of the C74’s muscular rear end. This allows the ability to run up to an 11" wide rear wheel with a 315 series rear tire for the ultimate in handling and traction. The number also pays homage to the legendary RENNtech V12 "SL 74".

2010 Mercedes C74 Konzept by Renntech High Resolution Exterior
- image 378243

This package is available now starting at $11,950. For more information regarding our C74 package and additional pricing options, visit our news blog:


  • Full Carbon Fiber Widebody kit (prototype shown)
  • Carbon Fiber Rear Decklid Spoiler
  • Carbon Fiber Front Splitter
  • Carbon Fiber Rear Diffuser w/ Integrated Exhaust Tips
  • 19 x 9.5" Front / 20 x 10.5" Rear Signature 3 Piece Forged Aluminum Wheels
  • Nitto INVO Performance Tires, 275 / 30 / CR 19 Front, 305 / 25 / CR 20 Rear


  • RENNtech Carbon Fiber Airbox and High Performance Air Filters
  • Custom Air Inlet Panel (prototype)
  • 82mm Throttle Bodies
  • Upgraded Camshafts
  • Modified Ported and Polished Cylinder Heads
  • RENNtech ECU / TCU Software Upgrades
  • Stainless Steel Headers
  • Sound and Performance Pipe
  • 100% Locking Limited-Slip Differential
  • Fully Adjustable Sports Suspension
  • Performance Braking Package stage 3 by RENNtech
  • Carbon Fiber Front and Rear Stabilizer Braces
    2010 Mercedes C74 Konzept by Renntech Exterior
- image 378249


  • Engine: 6.2L V-8
  • Power: 605 HP @ 6000 RPM and 555 LB-FT
  • 1/4-mile: 11.4 sec @126 MPH
  • Standing Mile: 185 MPH
  • Max Speed: 204 MPH
  • Rev limit: 7400 RPM
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  (630) posted on 03.23.2011

wow! Extremely gorgeous and I have to agree that it has an aggressive look. But i think this car is kind of heavy that could actually affect the performance of the car.

  (702) posted on 03.17.2011

Mercedes would always has that luxurious design that combines with the sportiness of the car. They shouldn’t include the LED lights or its better if they made a different style for it.

  (340) posted on 11.10.2010

I’d take it anyways, the body kit looks nice and subtle if you ask me, similar to the Black series cars. I’ve seen worse body kits.

  (407) posted on 11.2.2010

It seems that ford (Mustang) and Mercedes are constantly putting out variants of the same model simply for publicity purposes, and not for real innovation.

  (442) posted on 10.20.2010

yeah, it looks amazing, aggressive and very sporty but honestly i don’t like the front hood.

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