Until Ford finally grants our wishes and builds a Mustang SVO, the Focus RS’ 2.3-liter, turbocharged engine will go down as the brand’s most potent four-cylinder. And what a charmer it was, with 350 horsepower and 350 pound-feet of torque, this engine is a fantastic partner for some straight-line shenanigans. And it makes a great sound, too, with bangs and pops from the rear while lifting off, and plenty of turbo wooshiness under hard throttle.