On this week's episode of Ignition presented by Tire Rack (http://www.tirerack.com), Carlos Lago tests the ultimate drop top McLaren. With nearly 650 horsepower and 500 lb-ft of torque from its revised 3.8 liter twin turbo v8, the 650s is one of the fastest accelerating convertibles on the planet. With more power,  more grip and improved aero, will the 650s prove to be more than a facelifted 12C? Stay tuned and find out!

Ignition appears every other Monday on the Motor Trend youtube channel. http://www.youtube.com/motortrend

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