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Mercedes spotted testing hardcore AMG GT at the 'Ring

Mercedes has showcased its new AMG GT in both base and S trims, it's rolled out the GT3 racing version and the Formula One safety car. But we're only beginning to see the extent of the variants that the German automaker is expected to spin off of its new sportscar. And here is the latest. Spied undergoing testing at the Nurburgring is what appears to be an even more performance-focused version of the Mercedes-AMG GT. It seems to be packing an upgraded aero kit – complete with front splitter and rear wing – as well as larger rolling stock. You can bet there's an even more potent version underhood of the 4.0-liter twin-turbo V8 that's already producing over 500 hp in the existing model. Whether Affalterbach deems it worthy of the Black Series label or not is another question, but what's clear is that AMG is gunning for the Porsche 911 GT3 with the performance model you see here – however disguised it may be from our prying eyes. Related Video:

Aston Martin tipped for F1 return with Red Bull, Mercedes

Aston Martin could be plotting a return to Formula One for the first time in over half a century. And not as a backmarker, either. That is, at least, if the latest rumors materialize. While most automakers that participate in F1 do so as either a team owner (like Ferrari and Mercedes) or as an engine supplier (think Renault or Honda), the rumored Aston Martin deal would take a different approach. According to Autosport, the proposal would have the Red Bull Racing team run Aston Martin branding – but not its engines. Those would be provided by Mercedes, just like the engines in the British marque's upcoming slate of road cars. In that regard, the deal would not be unlike the one which Red Bull currently has with the Renault-Nissan Alliance, which sees the team running Renault engines and Infiniti branding. Andy Palmer was a pivotal figure in brokering that unusual arrangement when he was working for Carlos Ghosn, and is now tipped to be brokering a similar deal in his new capacity as Aston Martin's CEO. Though Aston has found glory in sports car racing (including Le Mans and its various associated series), it was never much of a contender in grand prix racing. It competed in a handful of races in 1959 and 1960, but never achieved results worth bragging about. Aston was rumored to be plotting a return when David Richards sat as chairman of the company, having run Aston's racing program as well as Honda's F1 team previously. Those rumors, however, never materialized. Whether this time 'round gains any traction remains to be seen - Aston Martin declined to either confirm or deny the reports when reached for comment by Autoblog. Red Bull has been growing increasingly dissatisfied (and increasingly vocal about its dissatisfaction) with Renault engines over the past couple of seasons. Though the two parties won four back-to-back world titles together, things took a noticeable step backward after the new turbo engine regulations took hold for the 2014 season. Nissan/Infiniti and Red Bull are contracted to continue collaborating until the end of next season. After that is when the new Aston deal could take hold, and Mercedes is reportedly keen on the idea so that it could add another customer to its F1 engine supply business and offset the costs of development. That could effectively prove the end of Renault in F1 (at least for the time being). Aside from Red Bull, the French automaker currently supplies only that outfit's sister team Toro Rosso.

Brabus boosts big Benz plug-in hybrid

With vehicles like the BMW i8 and Porsche 918 Spyder, the Germans have demonstrated as well as anyone that "performance" and "hybrid" can go in the same sentence. And now Brabus is plugging in to the performance hybrid station as well. Though nowhere near as extreme as the aforementioned PHEV sports cars, the Brabus PowerXtra B50 Hybrid performance kit kicks the Mercedes S550 Plug-In Hybrid up a notch. The electric side of the powertrain remains untouched, but the internal combustion engine has been boosted by 51 horsepower and 52 pound-feet of torque. That gives the 3.0-liter turbocharged V6 a total of 385 hp and 405 lb-ft, which is nothing to cough at – but with the electric boost kicking in, the vehicle now packs a combined output of 493 hp and 656 lb-ft. That slots its twist figure in between that of the S600 and S63 AMG. As a result, the big Brabus hybrid will now reach 62 miles per hour from a standstill in just 4.9 seconds (down from 5.2) – almost as quick as the 12-cylinder model but with half the pistons – though the top speed remains pegged at 155 mph. Naturally, Brabus didn't stop there, giving the sedan a new exhaust, aero kit, rolling stock and interior, all catered to the customer's specifications. BRABUS PowerXtra B50 Hybrid with 368 kW / 500 hp (493 bhp) and 890 Nm of torque The eco-friendly performance upgrade for the new Mercedes S 500 PLUG-IN HYBRID For more than 35 years, BRABUS has been the synonym for powerful high-performance automobiles and exclusive refinement at the highest level of perfection. One philosophy has always been paramount in all these years: combining top performance with exemplary eco-friendliness, immaculate durability and perfect everyday practicality. With the new BRABUS PowerXtra B50 Hybrid performance kit for the new Mercedes S 500 PLUG-IN HYBRID, the engine specialists of the world's largest independent tuner once more demonstrate their unrivalled know-how. The power increase of the V6 engine by 38 kW / 52 hp (51 bhp) and the boost in torque by 70 Nm (52 lb-ft) bumps the system output of the hybrid sedan to 368 kW / 500 hp (493 bhp) and system torque to 890 Nm (656 lb-ft). As a result, the luxury liner sprints from rest to 100 km/h (62 mph) in just 4.9 seconds, and impresses in daily driving with even further enhanced superiority. Due to the hybrid system, the top speed remains electronically limited to 250 km/h (155 mph).