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'Latest production version' of Porsche 918 shown off on Twitter

Porsche posted a picture of what it is calling "the latest production version" of the 2015 Porsche 918 Spyder on Twitter. It looks like the gasoline-hybrid supercar is being driven sportively on some California back roads during Monterey Speed Week.
Whatever updates were made to this version aren't visual (except for the paint), as the one Chris Harris drove last spring and another seen hot-weather testing in Nevada both had production bodies. We presume the changes are relatively minor and more than skin deep - perhaps brake calibration, suspension tuning or tweaks to the powertrain - but Porsche didn't release any more information.
The 918 Spyder is Porsche's latest supercar, which will compete with the LaFerrari and the McLaren P1 hybrid supercars. The Porsche may be the underdog of the group when considering horsepower, acceleration, top speed and price, but the 887-horsepower brute has the most advanced hybrid drivetrain of the three.

Mercedes-AMG GT vs. Porsche 911 [w/poll]

Mercedes-Benz designed the AMG GT to compete head-on with the Porsche 911. It's a clear, singular purpose, and Benz brings a lot of money, technology and race-bred expertise to the fight.
The AMG GT is Merc's followup to the awesome SLS AMG, the retro-modern, gullwing-doored coupe that took us by storm half a decade ago. But this new GT coupe is a more focused sports car than the SLS, rather than an all out supercar capable of extreme performance. It's got a brand-new V8 engine, and state-of-the-art technology that help it to not only be a proper Mercedes, but to be a serious performer.
Mercedes will sell its new baby in two models. The GT S arrives first, in spring 2015, followed by the standard GT in mid-2016. Of course, there's room to grow from there. And while Porsche may have already expanded its 911 range to include a vast variety of models, here's how Stuttgart's icon stacks up against Affalterbach's bad boy.

Jack Olsen built a Porsche 911 to drive every day and conquer Willow Springs

Almost two years ago we wrote about the 12-Gauge Garage Jack Olsen built to house his multifarious Porsche 911 - its 1972 bodywork hides four decades of Porsche parts, like the transaxle from a 1977 911 and the engine from 1995 911, for example. It weighs 2,400 pounds and has 272 horsepower, and Olsen uses it daily driving and for track days, the latter excursions featuring homemade, bolt-on aero parts. German magazine Auto Bild stopped by Olsen's house to look in on the Porsche called "Black Beauty II," and we get a few more details about the mods he's made, like swapping out for fiberglass body panels and welding Fuchs wheel centers to wider Corvette barrels so he could run different tires. Most importantly, though, Olsen divulges his passion for lowering his lap time at Willow Springs. Randy Pobst set the lap record for a production car around the 2.5-mile Big Willow track in a Porsche 918 Spyder at 1:23.54 during a Motor Trend test (the outright record, according to Willow Springs, is held by Michael Andretti at 1:06.050 in a CART car). Further down the list, Steve Millen drove a 415-hp 911 GT3 RS around the same track in 1:33.14 - a car 600 pounds heavier than Olsen's. Over the past 14 years of tinkering with his car, Olsen says his data shows his lap time is now down to 1:26.88, achieved on the day of filming the Auto Bild video. That time would put him in between the 1:26 flat posted by Dominik Farnbacher in a 608-hp Dodge Viper SRT-10 ACR and the 1:28.93 put up by Pobst in a 400-hp, 991-series 911. You can hear Olsen tell it in his own words in the video.