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Pagani Zonda R (2010) official promo video

Pagani is working flat out to ready its new C9 supercar for production, but that doesn't mean the current Zonda is being put out to pasture just yet. A year ago Pagani revealed the Zonda R, a track-only version of its seminal supercar. And now it's built a few of them the Italian company has got them together on track for a little fun.

Koenigsegg's craziest supercar yet debuts at Geneva

Here's what you need to know about the Koenigsegg One:1. It weighs 1,360 kilograms; it produces 1,360 hp. One horsepower per kilogram, which is why mad scientist Christian Von Koenigsegg is absolutely justified in bragging about it: it's the world's first "mega car," he said.

XCar takes a ride around London street circuit

One year ago, in the run up to the Formula One British Grand Prix, Spanish bank Santander unveiled a video concept for a London street circuit that they suggested could host the race. The GP currently takes place at Silverstone Circuit. F1 head honcho Bernie Ecclestone said he loves the idea of holding it on the streets of the swinging city.