Of course, just tossing in a slammer of an engine is one thing, but if you want a true sleeper you need to do more. And more is precisely what's been done. Aside from all the upgraded turbo parts ...

Numerous cases of engine problems suffered by the Ford Focus RS have forced Ford to extend free inspections and repairs to all owners affected, regardless of mileage or warranty status.

Focus RS Engineers Drop the Hammer: Hot Hatch Buyers to Get Monstrous Output of 350 Horsepower, 350 Lb.-Ft. • Unique 2.3-liter EcoBoost® engine powering all-new Focus RS certified at 350 ...