Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

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.

Alfa Romeo 4C

The production version of the Alfa Romeo 4C will make its debut at next month's Geneva motor show, two years after the concept appeared. Largely unchanged from the prototype, the 4C retains its mid-engined layout, short and wide proportions (less than 4,000mm long, 2,000mm wide, 1,180mm high and a 2,400mm wheelbase) and broadly similar surfacing. The changes appear to be more focused around productionized details.

Mazda MX-5 20th Anniversary Limited Edition launched

Mazda has released a limited edition MX-5 in Japan to commemorate 20 years of the MX-5 It’s hard to believe that the little Mazda MX-5 – or Mazda Roadster, as it’s known in Japan – has been with us for 20 years, but it has. And in that time it has racked up sales of more than 850,000, making it the best-selling open roadser in history. Deservedly so.