flaps
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http://blog.caranddriver.com/2016-ford-focus-rs-all-the-tech-details-you-could-ever-want/
The RS is powered by a substantially modified and transversely mounted version of the 2.3-liter four-cylinder EcoBoost that we’ve already seen in the Mustang. Peak output sits at 350 horsepower and 325 lb-ft of continuous torque, but an overboost function increases the latter figure to 350 lb-ft for short periods. The engine has a heavily revised twin-scroll turbocharger with a larger compressor housing and a unique airbox. It has high-tensile-strength cast-iron cylinder liners to deal with increased boost pressures, as well as a unique cylinder head. Which, in a fitting connection to the previous Escort and Sierra RS models of the 1980s and 1990s, is cast and machined by Cosworth in the U.K. The exhaust manages without any intermediate mufflers; apparently the back box alone is enough to meet noise regulations on both sides of the Atlantic, helped out by active acoustic flaps. Importantly, the engine has been tuned to rev harder than the Mustang’s tight-feeling powerplant, with the fuel cutoff not arriving until 6900 rpm. (Some of the changes apparently are now being considered for a higher-output version of the pony car.)
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