The standard Porsche 911 Turbo's 480HP 3.6-liter bi-turbocharged flat six is by no means a slouch, but where there's power, there's always space for even more power. Or at least that's what Porsche tuning specialist Sportec believes. The Swiss based tuner revealed a new version of its 911 Turbo based SPR1 that lifts the 3.6-liter flat six's output to a staggering 858 horsepower at 8,200 rpm and 642 lb-ft of peak torque at 4,800 rpm. Power is transferred to all four wheels through a six-speed manual gearbox.

Weighing in at 1,345kg or 2,965 lbs, the power-to-weight ratio is 637 horsepower per ton. According to Sportec, the SPR1 takes a mere 3.0 seconds to hit 62mph (100km/h,) with 186mph (300km/h) coming in just 18.9 seconds. The Swiss firm said that the supercar has recorded a top speed in excess of 236mph or 380km/h at Nardo, Italy.

Other highlights of the SPR1 include titanium connecting rods, a flat carbon fiber under floor, active suspension and F1 style ceramic brake discs plus composite (carbon / Kevlar) body panels, 20-inch forged alloy wheels, an integrated safety cage and a leather / alcantara interior.