The speedmeisters at 9ff have taken the already potent Porsche 911 GT2 and transformed it into an 850-horsepower beast decked out in classic Gulf livery that couldn't be sexier.

The BT-2 is a testament to the simple idea that more horsepower is always better. Not that the GT2 is a slouch, what with that 520-horsepower engine giving it a zero-to-62 mph time of 3.7 seconds and a top speed of 206 mph. It's not a car for the weak or the stupid, which is why it's nicknamed "the widowmaker." But that wasn't good enough for the guys at 9ff

They fitted the 3.6-liter twin-turbo mill with an improved exhaust and tweaked ECU. The result is 850 horsepower and a stunning 678 pound-feet of torque. Unleash all those ponies - if you dare - and the car will sprint to 62 mph in 3 seconds flat. Keep the hammer down and you'll see what 200 mph looks like in just 19 seconds. She'll top out at 240 mph if you're brave enough.

If the BT-2 isn't insane enough for you, there's always the GT9. It produces 987 horsepower and a top speed of 254. The company also is developing an even wilder version, called the GT9-R, slated to put down 1,120 horsepower.

Photos: 9ff. More pix after the jump.