Porsche chose Geneva for the world debut of the 911 GT3 RS. The uber coupe’s four-litre engine pumps out 500 brake horsepower for a 0-62mph time of 3.3 seconds. Lightweight components include a magnesium roof and carbon fibre engine cover, while a low front spoiler, large rear wing and pit lane limiter button have been designed for the racetrack. Audi revealed its all-new R8 and confirmed prices for the second generation supercar, with the range-topping V10 plus costing £137,500 OTR. On sale in May, the new R8 boasts a 0-62 time of 3.2 seconds and top speed 205mph. Danish sportscarmaker Zenvo unveiled an updated ST1. It's powered by the same turbocharged and supercharged 6.8-litre V8, which is now mated to a new faster-shifting sequential automatic transmission, bringing the ST1's 0-62 time down to under 3 seconds.