The W140 Mercedes S-Class was always available with plenty of grunt, but AMG tuner Renntech has seen fit to give the mighty luxobarge a bonkers 615-horsepower V12 upgrade. The resulting beast is known ...

Sometimes,” says Hartmut Feyhl, “I am a little ashamed to call myself a tuner.” Not because the calling itself isn’t noble (how can making cars go faster and handle better be otherwise?), but because ...

The AMG GT is one of the most exciting sportscars of the moment, a jewel in the Mercedes crown from both the engineering and design point of view. Even though on paper it's down on power compared to ...

Mercedes tuning experts RENNtech have introduced a new program that gives the Mercedes SLS AMG a significant boost under the hood. The new performance kit gives the 6.2-liter V8 engine a new output of ...

The E63 S is probably the most exciting sub-$200,000 car of the year. By no means it is the first Mercedes-AMG that comes with AWD, but it sets the bar higher than its predecessors. "How fast can I ...

LAKE PARK — Several weeks ago, I got a press release for a product that was designed to appeal to “tuners.” It was for some adhesive stripes that go on the side of a car, “for that tuner custom look!” ...

Renntech’s aftermarket package for the Mercedes-AMG S63 Coupe should appeal to those who, for one reason or another, didn’t want to go with the range-topping V12 S65 model of the series. Starting with ...

Just because the countries stop fighting doesn’t mean the individual soldiers won’t carry on. Earlier this week week AMG, Mercedes’ in-house tuner, called off the horsepower wars. Instead AMG will be ...

After an intense, 45-day build and grueling 30 days of campaigning for votes from friends, family, and total strangers, Mercedes-Benz announced that RENNTECH has won the MBUSA GLK tuner build-off! The ...

The SLR McLaren supercar has been quite a canvass for tuners--and even Mercedes itself. And though the end is near for the SLR, it won’t fade quietly into car history. Florida tuner Renntech is ...