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911 beware! Porsche testing new top-trim Boxster

The Boxster and Cayman are like the scrappy siblings compared to their star brother – the Porsche 911. And now it looks like the rivalry is about to get even more serious, as our spies have captured this hotted-up Boxster doing some winter testing. We've already seen Porsche evaluating a higher-performance version of the Cayman, rumored to be called the GT4. It would reportedly offer a taste of the thrills of the 911 GT3, but at a lower price. The coupe appears to have a convertible twin in this Boxster prototype. The biggest giveaway of their possible relationship is the shared front bumper with larger intakes and an extra opening at the tip of the hood. Although, this one lacks the Cayman's big, rear spoiler in favor of a smaller decklid unit. The good news for fans of shifting for themselves is that this tester is fitted with a manual transmission, according to our spies. Being a prototype, though, there's no guarantee that the gearbox makes it to production. At least in Cayman trim, these higher performance models might use a tuned version of the 3.4-liter flat-six with between 370 and 400 horsepower. Though, an earlier rumor suggested that a turbocharged four-cylinder could sit behind the driver. Until we know for sure, glance at the gallery to see a Porsche that might try to challenge its big brother.

Jerry Seinfeld is selling three rare and valuable Porsches

Jerry Seinfeld, whose car guy status has come to the fore in the post-Seinfeld universe with Comedians in Cars Getting Coffee, is selling a few of his Porsches. If you're expecting half-completed restoration candidates or tired old 930s, you're mistaken. What Seinfeld considers excess, most Porsche museums would jump up and down for ... and they might. But they'll have to bid. The three-lot Seinfeld Collection will be the highlight of the Amelia Island Auction by Gooding & Company on March 11th. At the top of the pre-auction estimate heap is a 1955 550 Spyder, one of the most coveted road cars the company made. It could go for $6m or more, and it's an interesting and lovely shade of blue. A seafoam green 1958 356 A GS/GT Carrera Speedster could bring $2.5m, and appears to still be stripped-down and set up for racing, as it would have been originally. And at the bottom of the heap is the 1974 911 Carrera 3.0 IROC RSR once driven by Peter Revson in the famous Roger Penske International Race of Champions. It should bring something north of $1m. Why is Seinfeld selling these rare and desirable Porsches? According to the comedian, it's simply time to send some of his collection "back into the world, for someone else to enjoy, as I have." Fair enough, although with the celebrity name attached to the auction, that enjoyment isn't going to come cheaply. Related Video: Gooding & Company Announces an Unprecedented Offering From the Esteemed Jerry Seinfeld Collection to Headline Amelia Island Auction Three highlights from the collection will be on display at the company's Scottsdale Auctions – the 1955 Porsche 550 Spyder, 1958 Porsche 356 A 1500 GS/GT Carrera Speedster and 1974 Porsche 911 Carrera 3.0 IROC RSR SANTA MONICA, Calif. (January 19, 2015) – Gooding & Company, the auction house acclaimed for selling the world's most significant and valuable collector cars with the tradition of presenting some of the greatest collections to ever come to market, is honored to announce a selection of consignments from The Jerry Seinfeld Collection to be sold at the Amelia Island Auction on March 11, 2016. A sampling of this exceptional collection will feature three historic Porsches at Gooding & Company's annual Scottsdale Auctions marquee beginning January 27, 2016.

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: