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Porsche 918 Spyder starts at $845,000

Porsche has officially put the 918 Spyder on sale for a breathtaking MSRP of $845,000. And, as an incentive to those who order the supercar, Porsche also is offering the opportunity to buy a limited-edition 911 Turbo S, called the 918 Spyder Edition. It will cost $161,650 for the coupe and $173,050 for the convertible.

Watch the Porsche 911 GT3 rear-steering system work

A handful of manufacturers have offered four-wheel steering in the past including Honda, Nissan, BMW, Mitsubishi, Mazda and, most recently, Acura and Porsche. On Monday, suspension expert Elephant Racing uploaded a video to its YouTube channel demonstrating the feature on the 2014 Porsche 911 GT3. In most four-wheel steering cars--Acura and Porsche included—a computer controls the movable rear wheels.

Build your Mini Cooper Hardtop

We suspect that your initial inclination upon the discovery of a new model's configurator is to throw gobs and gobs of equipment at a car to see just how high the price will go. After all, that's what we tend to do. It's especially satisfying with German automakers — notably Porsche and BMW — who seem to have turned option pricing into something bordering on absurdist theatre.