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The 2017 Porsche 911 RSR goes mid-engine, purists be damned

Porsche unveiled its World Endurance Championship and IMSA WeatherTech Championship competitor with the 2017 911 RSR. And this 911 is different from the rest, as the 4.0-liter flat-six engine powering this beast is in front of the rear axle, not behind it. That's right, this 24 Hours of Le Mans competitor ditches the iconic rear-engine layout. Porsche isn't talking specifics on how exactly things are arranged back there. The engine is new, now based on the 991 911's block instead of the previous Mezger motor that's been used for years. The transmission design is new as well – it would have to be to accommodate the new location relative to the engine. The racecar has been engineered to meet the LM-GTE class, where it will go up against other mid-engine cars like the Ford GT and Ferrari 488 GTE. Moving the engine to the middle has given Porsche the ability to fit the 911 RSR with massive bits of aero, like the humongous rear diffuser that looks like it would be more at home on a machine of war. The only thing that can compete with the diffuser for size is the top-mounted rear wing, which shares a similar design to the one found on the 919 Hybrid. Going back to the engine, the direct-injected boxer motor, depending on the size of the restrictor, generates as much as 510 horsepower and sends all of its fury to the rear wheels. The engine is paired to a six-speed sequential gearbox, which drivers can employ through paddles on the steering wheel. The new engine doesn't have a lot of weight to push around as the 911 RSR, as required by regulations, weighs 2,740 pounds. Speaking of weight, the engine layout isn't the only change for the 911 RSR. For 2017, the car ditches its steel body for one that's made out of carbon fiber. The body attaches to the chassis via quick-release fasteners, making the vehicle easier to service as exterior elements can be removed with minimal effort. The racecar also gets a radar-based collision system – aptly named the "Collision Avoid System" – which is meant to limit the 911 RSR's encounters with faster LMP prototypes. Only time will tell if the new layout and aerodynamic components help the 911 RSR beat its competition. But there will be plenty of opportunities to see the racecar in action as Porsche plans to run the 911 RSR in 19 races during the 2017 season, the first of which will take place at the IMSA opener on January 28th at Daytona, where the racecar will make its track day debut.

Porsche 911 GT spied streaking at the Nurburgring

At any given moment, you can bet that Porsche is testing some new version of the 911. When we see those prototypes undergoing testing, they're typically camouflaged, at least in part, to keep us from seeing what Zuffenhausen (or Weissach) is up to. But this particular example is completely undisguised. So what are we looking at, exactly? Well, for starters, it's likely the upcoming facelifted version of the current 911. The current 991 generation has been on the market now for four years, so the 991.2 (or 991.5, perhaps?) will likely be tasked with keeping Porsche's iconic sports car current for several more years to come. This version can be seen with front air intakes similar to those on the Cayman GT4, along with updated headlights, LED strips, new door handles, ventilated rear engine cover, reprofiled rear bumper, fresh taillights, and a new exhaust. The far bigger development is that the updated 911 is expected to ditch natural aspiration in favor of downsized turbocharged engines across almost the entire range – not just in the 911 Turbo. This particular version we see here, however, could be one of the few hold-outs for atmospheric pressure. That's because what we're looking at could be the upcoming back-to-basics version being prepared by the GT division – the same outfit responsible for the 911 GT3, GT3 RS, and Cayman GT4. Possibly adopting the name GT5, this new version of the 911 is anticipated to be the purist's choice: naturally aspirated flat-six, three-pedal manual transmission, skinny tires, no frills. This undisguised prototype appears to be packing a production roll cage and thin, leather-clad bucket seats – splitting the difference between racing buckets and the usual, thicker thrones. We'll have to wait a bit longer until Porsche is ready to release all the details of the refreshed 911, hopefully to include that GT version. But for an unadulterated taste of what's to come, look no further than the spy shots in the image gallery above. Related Video:

Mercedes S63 AMG Coupe vs Porsche Panamera Turbo S in unusual lux showdown

We'll admit it, we're really looking forward to more time with the Mercedes-Benz S-Class Coupe. Compared to other high-dollar luxury coupes - we're looking at you Bentley Continental GT - it's more stylish, easily more affordable, and since it's a Mercedes, lacks the sense of fragility that comes with a more exotic name plate.
Auto Express has taken a whack at reviewing the new two-door S-Class, and for some reason, the British mag is comparing it with a Porsche Panamera. Now, while comparing the looks of an S-Class Coupe and a Panamera is a bit like holding a beauty contest between Kate Upton and Medusa, this isn't as bizarre a pair as you might think, particularly when you opt for the high-dollar S63 AMG Coupe and the Panamera Turbo S.
The two offer similar power outputs from their force-induced V8s - 577 horsepower in the Benz and 570 horsepower in the Porsche - and are even similar in terms of interior and exterior dimensions. The S-Class actually has an extra inch between the axles and is 1.2 inches longer overall (it's also about 300 pounds heavier). In the cabin, the S-Class also has a tiny bit more rear legroom, with 33.4 inches to the Panamera's 33.3.